diff --git a/src/vs/workbench/api/test/browser/extHostAuthentication.integrationTest.ts b/src/vs/workbench/api/test/browser/extHostAuthentication.integrationTest.ts
index ec42932dfa290..918c097f5693f 100644
--- a/src/vs/workbench/api/test/browser/extHostAuthentication.integrationTest.ts
+++ b/src/vs/workbench/api/test/browser/extHostAuthentication.integrationTest.ts
@@ -31,6 +31,7 @@ import { IProductService } from '../../../../platform/product/common/productServ
 import { AuthenticationAccessService, IAuthenticationAccessService } from '../../../services/authentication/browser/authenticationAccessService.js';
 import { AuthenticationUsageService, IAuthenticationUsageService } from '../../../services/authentication/browser/authenticationUsageService.js';
 import { AuthenticationExtensionsService } from '../../../services/authentication/browser/authenticationExtensionsService.js';
+import { ILogService, NullLogService } from '../../../../platform/log/common/log.js';
 
 class AuthQuickPick {
 	private listener: ((e: IQuickPickDidAcceptEvent) => any) | undefined;
@@ -105,6 +106,7 @@ suite('ExtHostAuthentication', () => {
 
 	suiteSetup(async () => {
 		instantiationService = new TestInstantiationService();
+		instantiationService.stub(ILogService, new NullLogService());
 		instantiationService.stub(IDialogService, new TestDialogService({ confirmed: true }));
 		instantiationService.stub(IStorageService, new TestStorageService());
 		instantiationService.stub(IQuickInputService, new AuthTestQuickInputService());
diff --git a/src/vs/workbench/contrib/authentication/browser/authentication.contribution.ts b/src/vs/workbench/contrib/authentication/browser/authentication.contribution.ts
index 3575284deb696..f47d68b8f730f 100644
--- a/src/vs/workbench/contrib/authentication/browser/authentication.contribution.ts
+++ b/src/vs/workbench/contrib/authentication/browser/authentication.contribution.ts
@@ -22,6 +22,7 @@ import { ExtensionsRegistry } from '../../../services/extensions/common/extensio
 import { ManageTrustedExtensionsForAccountAction } from './actions/manageTrustedExtensionsForAccountAction.js';
 import { ManageAccountPreferencesForExtensionAction } from './actions/manageAccountPreferencesForExtensionAction.js';
 import { IAuthenticationUsageService } from '../../../services/authentication/browser/authenticationUsageService.js';
+import { ILogService } from '../../../../platform/log/common/log.js';
 
 const codeExchangeProxyCommand = CommandsRegistry.registerCommand('workbench.getCodeExchangeProxyEndpoints', function (accessor, _) {
 	const environmentService = accessor.get(IBrowserWorkbenchEnvironmentService);
@@ -117,7 +118,10 @@ class AuthenticationContribution extends Disposable implements IWorkbenchContrib
 		},
 	});
 
-	constructor(@IAuthenticationService private readonly _authenticationService: IAuthenticationService) {
+	constructor(
+		@IAuthenticationService private readonly _authenticationService: IAuthenticationService,
+		@ILogService private readonly _logService: ILogService
+	) {
 		super();
 		this._register(codeExchangeProxyCommand);
 		this._register(extensionFeature);
@@ -133,6 +137,7 @@ class AuthenticationContribution extends Disposable implements IWorkbenchContrib
 
 	private _registerAuthenticationExtentionPointHandler(): void {
 		authenticationExtPoint.setHandler((extensions, { added, removed }) => {
+			this._logService.info(`Found authentication providers. added: ${added.length}, removed: ${removed.length}`);
 			added.forEach(point => {
 				for (const provider of point.value) {
 					if (isFalsyOrWhitespace(provider.id)) {
@@ -147,6 +152,7 @@ class AuthenticationContribution extends Disposable implements IWorkbenchContrib
 
 					if (!this._authenticationService.declaredProviders.some(p => p.id === provider.id)) {
 						this._authenticationService.registerDeclaredAuthenticationProvider(provider);
+						this._logService.info(`Declared authentication provider: ${provider.id}`);
 					} else {
 						point.collector.error(localize('authentication.idConflict', "This authentication id '{0}' has already been registered", provider.id));
 					}
@@ -158,6 +164,7 @@ class AuthenticationContribution extends Disposable implements IWorkbenchContrib
 				const provider = this._authenticationService.declaredProviders.find(provider => provider.id === point.id);
 				if (provider) {
 					this._authenticationService.unregisterDeclaredAuthenticationProvider(provider.id);
+					this._logService.info(`Undeclared authentication provider: ${provider.id}`);
 				}
 			});
 		});
diff --git a/src/vs/workbench/services/authentication/browser/authenticationService.ts b/src/vs/workbench/services/authentication/browser/authenticationService.ts
index 76f95bfd22d6b..a142e9e0b4367 100644
--- a/src/vs/workbench/services/authentication/browser/authenticationService.ts
+++ b/src/vs/workbench/services/authentication/browser/authenticationService.ts
@@ -15,6 +15,7 @@ import { IAuthenticationAccessService } from './authenticationAccessService.js';
 import { AuthenticationProviderInformation, AuthenticationSession, AuthenticationSessionAccount, AuthenticationSessionsChangeEvent, IAuthenticationCreateSessionOptions, IAuthenticationProvider, IAuthenticationService } from '../common/authentication.js';
 import { IBrowserWorkbenchEnvironmentService } from '../../environment/browser/environmentService.js';
 import { ActivationKind, IExtensionService } from '../../extensions/common/extensions.js';
+import { ILogService } from '../../../../platform/log/common/log.js';
 
 export function getAuthenticationProviderActivationEvent(id: string): string { return `onAuthenticationRequest:${id}`; }
 
@@ -64,7 +65,8 @@ export class AuthenticationService extends Disposable implements IAuthentication
 	constructor(
 		@IExtensionService private readonly _extensionService: IExtensionService,
 		@IAuthenticationAccessService authenticationAccessService: IAuthenticationAccessService,
-		@IBrowserWorkbenchEnvironmentService private readonly _environmentService: IBrowserWorkbenchEnvironmentService
+		@IBrowserWorkbenchEnvironmentService private readonly _environmentService: IBrowserWorkbenchEnvironmentService,
+		@ILogService private readonly _logService: ILogService
 	) {
 		super();
 
@@ -95,6 +97,7 @@ export class AuthenticationService extends Disposable implements IAuthentication
 			return;
 		}
 		for (const provider of this._environmentService.options.authenticationProviders) {
+			this.registerDeclaredAuthenticationProvider(provider);
 			this.registerAuthenticationProvider(provider.id, provider);
 		}
 	}
@@ -126,6 +129,9 @@ export class AuthenticationService extends Disposable implements IAuthentication
 	}
 
 	registerAuthenticationProvider(id: string, authenticationProvider: IAuthenticationProvider): void {
+		if (!this._declaredProviders.find(p => p.id === id)) {
+			this._logService.warn(`Registering an authentication provider that is not declared in the Extension Manifest. This may cause unexpected behavior. id: ${id}, label: ${authenticationProvider.label}`);
+		}
 		this._authenticationProviders.set(id, authenticationProvider);
 		const disposableStore = new DisposableStore();
 		disposableStore.add(authenticationProvider.onDidChangeSessions(e => this._onDidChangeSessions.fire({
diff --git a/src/vs/workbench/services/authentication/test/browser/authenticationService.test.ts b/src/vs/workbench/services/authentication/test/browser/authenticationService.test.ts
index 11e50957b024e..c4b40487937cf 100644
--- a/src/vs/workbench/services/authentication/test/browser/authenticationService.test.ts
+++ b/src/vs/workbench/services/authentication/test/browser/authenticationService.test.ts
@@ -11,6 +11,7 @@ import { AuthenticationService } from '../../browser/authenticationService.js';
 import { AuthenticationProviderInformation, AuthenticationSessionsChangeEvent, IAuthenticationProvider } from '../../common/authentication.js';
 import { TestEnvironmentService } from '../../../../test/browser/workbenchTestServices.js';
 import { TestExtensionService, TestProductService, TestStorageService } from '../../../../test/common/workbenchTestServices.js';
+import { NullLogService } from '../../../../../platform/log/common/log.js';
 
 function createSession() {
 	return { id: 'session1', accessToken: 'token1', account: { id: 'account', label: 'Account' }, scopes: ['test'] };
@@ -37,7 +38,7 @@ suite('AuthenticationService', () => {
 	setup(() => {
 		const storageService = disposables.add(new TestStorageService());
 		const authenticationAccessService = disposables.add(new AuthenticationAccessService(storageService, TestProductService));
-		authenticationService = disposables.add(new AuthenticationService(new TestExtensionService(), authenticationAccessService, TestEnvironmentService));
+		authenticationService = disposables.add(new AuthenticationService(new TestExtensionService(), authenticationAccessService, TestEnvironmentService, new NullLogService()));
 	});
 
 	teardown(() => {