Fixes login validation for system-assigned managed identity. Closes p…

…np#6527

src/m365/commands/login.spec.ts

@@ -326,6 +326,15 @@ describe(commands.LOGIN, () => {
     assert.strictEqual(auth.connection.userName, undefined, 'Incorrect userName set');
   });
 
+  it('logs in to Microsoft 365 using system-assigned managed identity when authType identity set', async () => {
+    await command.action(logger, {
+      options: commandOptionsSchema.parse({
+        authType: 'identity'
+      })
+    });
+    assert.strictEqual(auth.connection.authType, AuthType.Identity, 'Incorrect authType set');
+  });
+
   it('logs in to Microsoft 365 using client secret authType "secret" set', async () => {
     await command.action(logger, {
       options: commandOptionsSchema.parse({

src/m365/commands/login.ts

@@ -50,16 +50,16 @@ class LoginCommand extends Command {
 
   public getRefinedSchema(schema: typeof options): z.ZodEffects<any> | undefined {
     return schema
-      .refine(options => typeof options.appId !== 'undefined' || cli.getClientId(), {
-        message: `appId is required. TIP: use the "m365 setup" command to configure the default appId`,
+      .refine(options => typeof options.appId !== 'undefined' || cli.getClientId() || options.authType === 'identity', {
+        message: `appId is required. TIP: use the "m365 setup" command to configure the default appId.`,
         path: ['appId']
       })
       .refine(options => options.authType !== 'password' || options.userName, {
-        message: 'Username is required when using password authentication',
+        message: 'Username is required when using password authentication.',
         path: ['userName']
       })
       .refine(options => options.authType !== 'password' || options.password, {
-        message: 'Password is required when using password authentication',
+        message: 'Password is required when using password authentication.',
         path: ['password']
       })
       .refine(options => options.authType !== 'certificate' || !(options.certificateFile && options.certificateBase64Encoded), {
@@ -71,13 +71,13 @@ class LoginCommand extends Command {
         options.certificateBase64Encoded ||
         cli.getConfig().get(settingsNames.clientCertificateFile) ||
         cli.getConfig().get(settingsNames.clientCertificateBase64Encoded), {
-        message: 'Specify either certificateFile or certificateBase64Encoded',
+        message: 'Specify either certificateFile or certificateBase64Encoded.',
         path: ['certificateFile']
       })
       .refine(options => options.authType !== 'secret' ||
         options.secret ||
         cli.getConfig().get(settingsNames.clientSecret), {
-        message: 'Secret is required when using secret authentication',
+        message: 'Secret is required when using secret authentication.',
         path: ['secret']
       });
   }