diff --git a/app/stores/AuthStore.ts b/app/stores/AuthStore.ts
index 5f4d80168..f5b1f993d 100644
--- a/app/stores/AuthStore.ts
+++ b/app/stores/AuthStore.ts
@@ -144,7 +144,9 @@ export default class AuthStore {
   @action
   fetch = async () => {
     try {
-      const res = await client.post("/auth.info");
+      const res = await client.post("/auth.info", undefined, {
+        credentials: "same-origin",
+      });
       invariant(res?.data, "Auth not available");
       runInAction("AuthStore#fetch", () => {
         this.addPolicies(res.policies);
diff --git a/app/utils/ApiClient.ts b/app/utils/ApiClient.ts
index d4f2635ca..f4591911a 100644
--- a/app/utils/ApiClient.ts
+++ b/app/utils/ApiClient.ts
@@ -25,6 +25,7 @@ type Options = {
 
 type FetchOptions = {
   download?: boolean;
+  credentials?: "omit" | "same-origin" | "include";
   headers?: Record<string, string>;
 };
 
@@ -111,7 +112,11 @@ class ApiClient {
         // not needed for authentication this offers a performance increase.
         // For self-hosted we include them to support a wide variety of
         // authenticated proxies, e.g. Pomerium, Cloudflare Access etc.
-        credentials: isCloudHosted ? "omit" : "same-origin",
+        credentials: options.credentials
+          ? options.credentials
+          : isCloudHosted
+          ? "omit"
+          : "same-origin",
         cache: "no-cache",
       });
     } catch (err) {
diff --git a/server/migrations/20220816175234-user-email-index.js b/server/migrations/20220816175234-user-email-index.js
new file mode 100644
index 000000000..9e97b2b02
--- /dev/null
+++ b/server/migrations/20220816175234-user-email-index.js
@@ -0,0 +1,11 @@
+'use strict';
+
+module.exports = {
+  async up (queryInterface) {
+    await queryInterface.addIndex("users", ["email"]);
+  },
+
+  async down (queryInterface) {
+    await queryInterface.removeIndex("users", ["email"]);
+  }
+};
diff --git a/server/models/User.test.ts b/server/models/User.test.ts
index e921813e2..362abc924 100644
--- a/server/models/User.test.ts
+++ b/server/models/User.test.ts
@@ -26,12 +26,26 @@ describe("user model", () => {
       expect(await UserAuthentication.count()).toBe(0);
     });
   });
+
   describe("getJwtToken", () => {
     it("should set JWT secret", async () => {
       const user = await buildUser();
       expect(user.getJwtToken()).toBeTruthy();
     });
   });
+
+  describe("availableTeams", () => {
+    it("should return teams where another user with the same email exists", async () => {
+      const user = await buildUser();
+      const anotherUser = await buildUser({ email: user.email });
+
+      const response = await user.availableTeams();
+      expect(response.length).toEqual(2);
+      expect(response[0].id).toEqual(user.teamId);
+      expect(response[1].id).toEqual(anotherUser.teamId);
+    });
+  });
+
   describe("collectionIds", () => {
     it("should return read_write collections", async () => {
       const team = await buildTeam();
diff --git a/server/models/User.ts b/server/models/User.ts
index 404571b54..ffa69dbfc 100644
--- a/server/models/User.ts
+++ b/server/models/User.ts
@@ -405,6 +405,23 @@ class User extends ParanoidModel {
     );
   };
 
+  /**
+   * Returns a list of teams that have a user matching this user's email.
+   *
+   * @returns A promise resolving to a list of teams
+   */
+  availableTeams = async () => {
+    return Team.findAll({
+      include: [
+        {
+          model: this.constructor as typeof User,
+          required: true,
+          where: { email: this.email },
+        },
+      ],
+    });
+  };
+
   demote = async (to: UserRole, options?: SaveOptions<User>) => {
     const res = await (this.constructor as typeof User).findAndCountAll({
       where: {
diff --git a/server/presenters/availableTeam.ts b/server/presenters/availableTeam.ts
new file mode 100644
index 000000000..175345800
--- /dev/null
+++ b/server/presenters/availableTeam.ts
@@ -0,0 +1,11 @@
+import { Team } from "@server/models";
+
+export default function present(team: Team, isSignedIn = false) {
+  return {
+    id: team.id,
+    name: team.name,
+    avatarUrl: team.logoUrl,
+    url: team.url,
+    isSignedIn,
+  };
+}
diff --git a/server/presenters/index.ts b/server/presenters/index.ts
index cf82fec15..894739d2d 100644
--- a/server/presenters/index.ts
+++ b/server/presenters/index.ts
@@ -1,5 +1,6 @@
 import presentApiKey from "./apiKey";
 import presentAuthenticationProvider from "./authenticationProvider";
+import presentAvailableTeam from "./availableTeam";
 import presentCollection from "./collection";
 import presentCollectionGroupMembership from "./collectionGroupMembership";
 import presentDocument from "./document";
@@ -26,28 +27,29 @@ import presentWebhookSubscription from "./webhookSubscription";
 
 export {
   presentApiKey,
-  presentFileOperation,
   presentAuthenticationProvider,
-  presentUser,
-  presentView,
+  presentAvailableTeam,
+  presentCollection,
+  presentCollectionGroupMembership,
   presentDocument,
   presentEvent,
-  presentRevision,
-  presentCollection,
-  presentShare,
-  presentSearchQuery,
-  presentStar,
-  presentSubscription,
-  presentTeam,
+  presentFileOperation,
   presentGroup,
+  presentGroupMembership,
   presentIntegration,
   presentMembership,
   presentNotificationSetting,
-  presentSlackAttachment,
   presentPin,
   presentPolicies,
-  presentGroupMembership,
-  presentCollectionGroupMembership,
+  presentRevision,
+  presentSearchQuery,
+  presentShare,
+  presentSlackAttachment,
+  presentStar,
+  presentSubscription,
+  presentTeam,
+  presentUser,
+  presentView,
   presentWebhook,
   presentWebhookSubscription,
 };
diff --git a/server/presenters/team.ts b/server/presenters/team.ts
index 400941cd1..d48daa2f9 100644
--- a/server/presenters/team.ts
+++ b/server/presenters/team.ts
@@ -16,6 +16,6 @@ export default function present(team: Team) {
     url: team.url,
     defaultUserRole: team.defaultUserRole,
     inviteRequired: team.inviteRequired,
-    allowedDomains: team.allowedDomains.map((d) => d.name),
+    allowedDomains: team.allowedDomains?.map((d) => d.name),
   };
 }
diff --git a/server/routes/api/auth.test.ts b/server/routes/api/auth.test.ts
index 96d80b43e..f84b070d5 100644
--- a/server/routes/api/auth.test.ts
+++ b/server/routes/api/auth.test.ts
@@ -3,6 +3,16 @@ import env from "@server/env";
 import { buildUser, buildTeam } from "@server/test/factories";
 import { getTestDatabase, getTestServer } from "@server/test/support";
 
+const mockTeamInSessionId = "1e023d05-951c-41c6-9012-c9fa0402e1c3";
+
+jest.mock("@server/utils/authentication", () => {
+  return {
+    getSessionsInCookie() {
+      return { [mockTeamInSessionId]: {} };
+    },
+  };
+});
+
 const db = getTestDatabase();
 const server = getTestServer();
 
@@ -13,16 +23,32 @@ beforeEach(db.flush);
 describe("#auth.info", () => {
   it("should return current authentication", async () => {
     const team = await buildTeam();
+    const team2 = await buildTeam();
+    const team3 = await buildTeam({
+      id: mockTeamInSessionId,
+    });
+
     const user = await buildUser({
       teamId: team.id,
     });
+    await buildUser();
+    await buildUser({
+      teamId: team2.id,
+      email: user.email,
+    });
     const res = await server.post("/api/auth.info", {
       body: {
         token: user.getJwtToken(),
       },
     });
     const body = await res.json();
+    const availableTeamIds = body.data.availableTeams.map((t: any) => t.id);
+
     expect(res.status).toEqual(200);
+    expect(availableTeamIds.length).toEqual(3);
+    expect(availableTeamIds).toContain(team.id);
+    expect(availableTeamIds).toContain(team2.id);
+    expect(availableTeamIds).toContain(team3.id);
     expect(body.data.user.name).toBe(user.name);
     expect(body.data.team.name).toBe(team.name);
     expect(body.data.team.allowedDomains).toEqual([]);
diff --git a/server/routes/api/auth.ts b/server/routes/api/auth.ts
index dbef44147..df7911f29 100644
--- a/server/routes/api/auth.ts
+++ b/server/routes/api/auth.ts
@@ -1,12 +1,18 @@
 import Router from "koa-router";
-import { find } from "lodash";
+import { find, uniqBy } from "lodash";
 import { parseDomain } from "@shared/utils/domains";
 import { sequelize } from "@server/database/sequelize";
 import env from "@server/env";
 import auth from "@server/middlewares/authentication";
 import { Event, Team } from "@server/models";
-import { presentUser, presentTeam, presentPolicies } from "@server/presenters";
+import {
+  presentUser,
+  presentTeam,
+  presentPolicies,
+  presentAvailableTeam,
+} from "@server/presenters";
 import ValidateSSOAccessTask from "@server/queues/tasks/ValidateSSOAccessTask";
+import { getSessionsInCookie } from "@server/utils/authentication";
 import providers from "../auth/providers";
 
 const router = new Router();
@@ -107,9 +113,20 @@ router.post("auth.config", async (ctx) => {
 
 router.post("auth.info", auth(), async (ctx) => {
   const { user } = ctx.state;
-  const team = await Team.scope("withDomains").findByPk(user.teamId, {
-    rejectOnEmpty: true,
-  });
+  const sessions = getSessionsInCookie(ctx);
+  const signedInTeamIds = Object.keys(sessions);
+
+  const [team, signedInTeams, availableTeams] = await Promise.all([
+    Team.scope("withDomains").findByPk(user.teamId, {
+      rejectOnEmpty: true,
+    }),
+    Team.findAll({
+      where: {
+        id: signedInTeamIds,
+      },
+    }),
+    user.availableTeams(),
+  ]);
 
   await ValidateSSOAccessTask.schedule({ userId: user.id });
 
@@ -119,6 +136,15 @@ router.post("auth.info", auth(), async (ctx) => {
         includeDetails: true,
       }),
       team: presentTeam(team),
+      availableTeams: uniqBy(
+        [...signedInTeams, ...availableTeams],
+        "id"
+      ).map((team) =>
+        presentAvailableTeam(
+          team,
+          signedInTeamIds.includes(team.id) || team.id === user.teamId
+        )
+      ),
     },
     policies: presentPolicies(user, [team]),
   };
diff --git a/server/utils/authentication.ts b/server/utils/authentication.ts
index c1f3dccd3..e3983a163 100644
--- a/server/utils/authentication.ts
+++ b/server/utils/authentication.ts
@@ -7,6 +7,20 @@ import env from "@server/env";
 import Logger from "@server/logging/Logger";
 import { User, Event, Team, Collection, View } from "@server/models";
 
+/**
+ * Parse and return the details from the "sessions" cookie in the request, if
+ * any. The cookie is on the apex domain and includes session details for
+ * other subdomains.
+ *
+ * @param ctx The Koa context
+ * @returns The session details
+ */
+export function getSessionsInCookie(ctx: Context) {
+  return JSON.parse(
+    decodeURIComponent(ctx.cookies.get("sessions") || "") || "{}"
+  );
+}
+
 export async function signIn(
   ctx: Context,
   user: User,
@@ -68,9 +82,7 @@ export async function signIn(
   // to the teams subdomain if subdomains are enabled
   if (env.SUBDOMAINS_ENABLED && team.subdomain) {
     // get any existing sessions (teams signed in) and add this team
-    const existing = JSON.parse(
-      decodeURIComponent(ctx.cookies.get("sessions") || "") || "{}"
-    );
+    const existing = getSessionsInCookie(ctx);
     const sessions = encodeURIComponent(
       JSON.stringify({
         ...existing,