diff --git a/docs/docs/cmd/teams/user/user-app-add.mdx b/docs/docs/cmd/teams/user/user-app-add.mdx
index e81d6baf867..34a602b7a06 100644
--- a/docs/docs/cmd/teams/user/user-app-add.mdx
+++ b/docs/docs/cmd/teams/user/user-app-add.mdx
@@ -16,8 +16,11 @@ m365 teams user app add [options]
 `--id <id>`
 : The ID of the app to install.
 
-`--userId <userId>`
-: The ID of the user to install the app for.
+`--userId [userId]`
+: The ID of the user to install the app for. Specify either `userId` or `userName` but not both.
+
+`--userName [userName]`
+: The UPN of the user to install the app for. Specify either `userId` or `userName` but not both.
 ```
 
 <Global />
@@ -28,12 +31,18 @@ The `id` has to be the ID of the app from the Microsoft Teams App Catalog. Do no
 
 ## Examples
 
-Install an app from the catalog for the specified user.
+Install an app from the catalog for the specified user by id.
 
 ```sh
 m365 teams user app add --id 4440558e-8c73-4597-abc7-3644a64c4bce --userId 2609af39-7775-4f94-a3dc-0dd67657e900
 ```
 
+Install an app from the catalog for the specified user by name.
+
+```sh
+m365 teams user app add --id 4440558e-8c73-4597-abc7-3644a64c4bce --userName admin@contoso.com
+```
+
 ## Response
 
 The command won't return a response on success.
diff --git a/docs/docs/cmd/teams/user/user-app-remove.mdx b/docs/docs/cmd/teams/user/user-app-remove.mdx
index 30c0ee16798..ed3fb280be6 100644
--- a/docs/docs/cmd/teams/user/user-app-remove.mdx
+++ b/docs/docs/cmd/teams/user/user-app-remove.mdx
@@ -14,16 +14,16 @@ m365 teams user app remove [options]
 
 ```md definition-list
 `--id [id]`
-: The unique id of the app instance installed for the user. Specify either `id` or `name`.
+: The unique id of the app instance installed for the user. Specify either `id` or `name` but not both.
 
 `--name [name]`
-: Name of the app instance installed for the user. Specify either `id` or `name`.
+: Name of the app instance installed for the user. Specify either `id` or `name` but not both.
 
 `--userId [userId]`
-: The ID of the user to uninstall the app for. Specify `userId` or `userName` but not both.
+: The ID of the user to uninstall the app for. Specify either `userId` or `userName` but not both.
 
 `--userName [userName]`
-: The UPN of the user to uninstall the app for. Specify `userId` or `userName` but not both.
+: The UPN of the user to uninstall the app for. Specify either `userId` or `userName` but not both.
 
 `-f, --force`
 : Confirm removal of app for user.
diff --git a/src/m365/teams/commands/user/user-app-add.spec.ts b/src/m365/teams/commands/user/user-app-add.spec.ts
index ff4c09d0f9d..7b0ef2374ce 100644
--- a/src/m365/teams/commands/user/user-app-add.spec.ts
+++ b/src/m365/teams/commands/user/user-app-add.spec.ts
@@ -72,6 +72,16 @@ describe(commands.USER_APP_ADD, () => {
     assert.notStrictEqual(actual, true);
   });
 
+  it('fails validation if the userName is not a valid UPN.', async () => {
+    const actual = await command.validate({
+      options: {
+        userName: "no-an-email",
+        id: '15d7a78e-fd77-4599-97a5-dbb6372846c5'
+      }
+    }, commandInfo);
+    assert.notStrictEqual(actual, true);
+  });
+
   it('fails validation if the id is not a valid guid.', async () => {
     const actual = await command.validate({
       options: {
@@ -92,7 +102,17 @@ describe(commands.USER_APP_ADD, () => {
     assert.strictEqual(actual, true);
   });
 
-  it('adds app from the catalog for the specified user', async () => {
+  it('passes validation when the input is correct (userName)', async () => {
+    const actual = await command.validate({
+      options: {
+        id: '15d7a78e-fd77-4599-97a5-dbb6372846c5',
+        userName: 'admin@contoso.com'
+      }
+    }, commandInfo);
+    assert.strictEqual(actual, true);
+  });
+
+  it('adds app from the catalog for the specified user by id', async () => {
     sinon.stub(request, 'post').callsFake(async (opts) => {
       if (opts.url === `https://graph.microsoft.com/v1.0/users/c527a470-a882-481c-981c-ee6efaba85c7/teamwork/installedApps` &&
         JSON.stringify(opts.data) === `{"teamsApp@odata.bind":"https://graph.microsoft.com/v1.0/appCatalogs/teamsApps/4440558e-8c73-4597-abc7-3644a64c4bce"}`) {
@@ -110,6 +130,24 @@ describe(commands.USER_APP_ADD, () => {
     } as any);
   });
 
+  it('adds app from the catalog for the specified user by name', async () => {
+    sinon.stub(request, 'post').callsFake(async (opts) => {
+      if (opts.url === `https://graph.microsoft.com/v1.0/users/admin%40contoso.com/teamwork/installedApps` &&
+        JSON.stringify(opts.data) === `{"teamsApp@odata.bind":"https://graph.microsoft.com/v1.0/appCatalogs/teamsApps/4440558e-8c73-4597-abc7-3644a64c4bce"}`) {
+        return;
+      }
+
+      throw 'Invalid request';
+    });
+
+    await command.action(logger, {
+      options: {
+        userName: 'admin@contoso.com',
+        id: '4440558e-8c73-4597-abc7-3644a64c4bce'
+      }
+    } as any);
+  });
+
   it('correctly handles error while installing teams app', async () => {
     const error = {
       "error": {
diff --git a/src/m365/teams/commands/user/user-app-add.ts b/src/m365/teams/commands/user/user-app-add.ts
index 6b7e3674920..525fb4c6747 100644
--- a/src/m365/teams/commands/user/user-app-add.ts
+++ b/src/m365/teams/commands/user/user-app-add.ts
@@ -1,6 +1,7 @@
 import { Logger } from '../../../../cli/Logger.js';
 import GlobalOptions from '../../../../GlobalOptions.js';
 import request, { CliRequestOptions } from '../../../../request.js';
+import { formatting } from '../../../../utils/formatting.js';
 import { validation } from '../../../../utils/validation.js';
 import GraphCommand from '../../../base/GraphCommand.js';
 import commands from '../../commands.js';
@@ -11,7 +12,8 @@ interface CommandArgs {
 
 interface Options extends GlobalOptions {
   id: string;
-  userId: string;
+  userId?: string;
+  userName?: string;
 }
 
 class TeamsUserAppAddCommand extends GraphCommand {
@@ -26,8 +28,19 @@ class TeamsUserAppAddCommand extends GraphCommand {
   constructor() {
     super();
 
+    this.#initTelemetry();
     this.#initOptions();
     this.#initValidators();
+    this.#initOptionSets();
+  }
+
+  #initTelemetry(): void {
+    this.telemetry.push((args: CommandArgs) => {
+      Object.assign(this.telemetryProperties, {
+        userId: typeof args.options.userId !== 'undefined',
+        userName: typeof args.options.userName !== 'undefined'
+      });
+    });
   }
 
   #initOptions(): void {
@@ -36,7 +49,10 @@ class TeamsUserAppAddCommand extends GraphCommand {
         option: '--id <id>'
       },
       {
-        option: '--userId <userId>'
+        option: '--userId [userId]'
+      },
+      {
+        option: '--userName [userName]'
       }
     );
   }
@@ -48,20 +64,29 @@ class TeamsUserAppAddCommand extends GraphCommand {
           return `${args.options.id} is not a valid GUID`;
         }
 
-        if (!validation.isValidGuid(args.options.userId)) {
+        if (args.options.userId && !validation.isValidGuid(args.options.userId)) {
           return `${args.options.userId} is not a valid GUID`;
         }
 
+        if (args.options.userName && !validation.isValidUserPrincipalName(args.options.userName)) {
+          return `${args.options.userName} is not a valid userName`;
+        }
+
         return true;
       }
     );
   }
 
+  #initOptionSets(): void {
+    this.optionSets.push({ options: ['userId', 'userName'] });
+  }
+
   public async commandAction(logger: Logger, args: CommandArgs): Promise<void> {
+    const userId: string = (args.options.userId ?? args.options.userName) as string;
     const endpoint: string = `${this.resource}/v1.0`;
 
     const requestOptions: CliRequestOptions = {
-      url: `${endpoint}/users/${args.options.userId}/teamwork/installedApps`,
+      url: `${endpoint}/users/${formatting.encodeQueryParameter(userId)}/teamwork/installedApps`,
       headers: {
         'content-type': 'application/json;odata=nometadata',
         'accept': 'application/json;odata.metadata=none'