diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index 0168ece55df..6ebd6b36556 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -16,48 +16,6 @@
 
 declare module 'vscode' {
 
-	//#region auth provider: https://github.com/microsoft/vscode/issues/88309
-
-	/**
-	 * An {@link Event} which fires when an {@link AuthenticationProvider} is added or removed.
-	 */
-	export interface AuthenticationProvidersChangeEvent {
-		/**
-		 * The ids of the {@link AuthenticationProvider}s that have been added.
-		 */
-		readonly added: ReadonlyArray<AuthenticationProviderInformation>;
-
-		/**
-		 * The ids of the {@link AuthenticationProvider}s that have been removed.
-		 */
-		readonly removed: ReadonlyArray<AuthenticationProviderInformation>;
-	}
-
-	export namespace authentication {
-		/**
-		 * @deprecated - getSession should now trigger extension activation.
-		 * Fires with the provider id that was registered or unregistered.
-		 */
-		export const onDidChangeAuthenticationProviders: Event<AuthenticationProvidersChangeEvent>;
-
-		/**
-		 * @deprecated
-		 * An array of the information of authentication providers that are currently registered.
-		 */
-		export const providers: ReadonlyArray<AuthenticationProviderInformation>;
-
-		/**
-		 * @deprecated
-		 * Logout of a specific session.
-		 * @param providerId The id of the provider to use
-		 * @param sessionId The session id to remove
-		 * provider
-		 */
-		export function logout(providerId: string, sessionId: string): Thenable<void>;
-	}
-
-	//#endregion
-
 	// eslint-disable-next-line vscode-dts-region-comments
 	//#region @alexdima - resolvers
 
diff --git a/src/vs/workbench/api/browser/mainThreadAuthentication.ts b/src/vs/workbench/api/browser/mainThreadAuthentication.ts
index c54c35799ef..824aa63c881 100644
--- a/src/vs/workbench/api/browser/mainThreadAuthentication.ts
+++ b/src/vs/workbench/api/browser/mainThreadAuthentication.ts
@@ -152,14 +152,6 @@ export class MainThreadAuthentication extends Disposable implements MainThreadAu
 			this._proxy.$onDidChangeAuthenticationSessions(e.providerId, e.label);
 		}));
 
-		this._register(this.authenticationService.onDidRegisterAuthenticationProvider(info => {
-			this._proxy.$onDidChangeAuthenticationProviders([info], []);
-		}));
-
-		this._register(this.authenticationService.onDidUnregisterAuthenticationProvider(info => {
-			this._proxy.$onDidChangeAuthenticationProviders([], [info]);
-		}));
-
 		this._proxy.$setProviders(this.authenticationService.declaredProviders);
 
 		this._register(this.authenticationService.onDidChangeDeclaredProviders(e => {
diff --git a/src/vs/workbench/api/common/extHost.api.impl.ts b/src/vs/workbench/api/common/extHost.api.impl.ts
index 22080ab47fc..dd7808fb806 100644
--- a/src/vs/workbench/api/common/extHost.api.impl.ts
+++ b/src/vs/workbench/api/common/extHost.api.impl.ts
@@ -233,18 +233,6 @@ export function createApiFactoryAndRegisterActors(accessor: ServicesAccessor): I
 			},
 			registerAuthenticationProvider(id: string, label: string, provider: vscode.AuthenticationProvider, options?: vscode.AuthenticationProviderOptions): vscode.Disposable {
 				return extHostAuthentication.registerAuthenticationProvider(id, label, provider, options);
-			},
-			get onDidChangeAuthenticationProviders(): Event<vscode.AuthenticationProvidersChangeEvent> {
-				checkProposedApiEnabled(extension);
-				return extHostAuthentication.onDidChangeAuthenticationProviders;
-			},
-			get providers(): ReadonlyArray<vscode.AuthenticationProviderInformation> {
-				checkProposedApiEnabled(extension);
-				return extHostAuthentication.providers;
-			},
-			logout(providerId: string, sessionId: string): Thenable<void> {
-				checkProposedApiEnabled(extension);
-				return extHostAuthentication.removeSession(providerId, sessionId);
 			}
 		};
 
diff --git a/src/vs/workbench/api/common/extHost.protocol.ts b/src/vs/workbench/api/common/extHost.protocol.ts
index cdee29bf300..742227bf7a2 100644
--- a/src/vs/workbench/api/common/extHost.protocol.ts
+++ b/src/vs/workbench/api/common/extHost.protocol.ts
@@ -1281,7 +1281,6 @@ export interface ExtHostAuthenticationShape {
 	$createSession(id: string, scopes: string[]): Promise<modes.AuthenticationSession>;
 	$removeSession(id: string, sessionId: string): Promise<void>;
 	$onDidChangeAuthenticationSessions(id: string, label: string): Promise<void>;
-	$onDidChangeAuthenticationProviders(added: modes.AuthenticationProviderInformation[], removed: modes.AuthenticationProviderInformation[]): Promise<void>;
 	$setProviders(providers: modes.AuthenticationProviderInformation[]): Promise<void>;
 }
 
diff --git a/src/vs/workbench/api/common/extHostAuthentication.ts b/src/vs/workbench/api/common/extHostAuthentication.ts
index c134a357403..97cd1fb2689 100644
--- a/src/vs/workbench/api/common/extHostAuthentication.ts
+++ b/src/vs/workbench/api/common/extHostAuthentication.ts
@@ -27,9 +27,6 @@ export class ExtHostAuthentication implements ExtHostAuthenticationShape {
 
 	private _providers: vscode.AuthenticationProviderInformation[] = [];
 
-	private _onDidChangeAuthenticationProviders = new Emitter<vscode.AuthenticationProvidersChangeEvent>();
-	readonly onDidChangeAuthenticationProviders: Event<vscode.AuthenticationProvidersChangeEvent> = this._onDidChangeAuthenticationProviders.event;
-
 	private _onDidChangeSessions = new Emitter<vscode.AuthenticationSessionsChangeEvent>();
 	readonly onDidChangeSessions: Event<vscode.AuthenticationSessionsChangeEvent> = this._onDidChangeSessions.event;
 
@@ -44,10 +41,6 @@ export class ExtHostAuthentication implements ExtHostAuthenticationShape {
 		return Promise.resolve();
 	}
 
-	get providers(): ReadonlyArray<vscode.AuthenticationProviderInformation> {
-		return Object.freeze(this._providers.slice());
-	}
-
 	async getSession(requestingExtension: IExtensionDescription, providerId: string, scopes: readonly string[], options: vscode.AuthenticationGetSessionOptions & { createIfNone: true }): Promise<vscode.AuthenticationSession>;
 	async getSession(requestingExtension: IExtensionDescription, providerId: string, scopes: readonly string[], options: vscode.AuthenticationGetSessionOptions = {}): Promise<vscode.AuthenticationSession | undefined> {
 		const extensionId = ExtensionIdentifier.toKey(requestingExtension.identifier);
@@ -164,22 +157,4 @@ export class ExtHostAuthentication implements ExtHostAuthenticationShape {
 		this._onDidChangeSessions.fire({ provider: { id, label } });
 		return Promise.resolve();
 	}
-
-	$onDidChangeAuthenticationProviders(added: modes.AuthenticationProviderInformation[], removed: modes.AuthenticationProviderInformation[]) {
-		added.forEach(provider => {
-			if (!this._providers.some(p => p.id === provider.id)) {
-				this._providers.push(provider);
-			}
-		});
-
-		removed.forEach(p => {
-			const index = this._providers.findIndex(provider => provider.id === p.id);
-			if (index > -1) {
-				this._providers.splice(index);
-			}
-		});
-
-		this._onDidChangeAuthenticationProviders.fire({ added, removed });
-		return Promise.resolve();
-	}
 }
diff --git a/src/vs/workbench/test/browser/api/mainThreadAuthentication.test.ts b/src/vs/workbench/test/browser/api/mainThreadAuthentication.test.ts
index 92a924aed86..3a2b733ada0 100644
--- a/src/vs/workbench/test/browser/api/mainThreadAuthentication.test.ts
+++ b/src/vs/workbench/test/browser/api/mainThreadAuthentication.test.ts
@@ -103,7 +103,6 @@ suite('MainThreadAuthentication', () => {
 						},
 						$removeSession(id: string, sessionId: string) { return Promise.resolve(); },
 						$onDidChangeAuthenticationSessions(id: string, label: string) { return Promise.resolve(); },
-						$onDidChangeAuthenticationProviders(added: AuthenticationProviderInformation[], removed: AuthenticationProviderInformation[]) { return Promise.resolve(); },
 						$setProviders(providers: AuthenticationProviderInformation[]) { return Promise.resolve(); }
 					};
 				}