diff --git a/packages-exp/auth-compat-exp/src/auth.ts b/packages-exp/auth-compat-exp/src/auth.ts
index a4ea71f359d..513ab3f7036 100644
--- a/packages-exp/auth-compat-exp/src/auth.ts
+++ b/packages-exp/auth-compat-exp/src/auth.ts
@@ -39,7 +39,8 @@ import { ReverseWrapper, Wrapper } from './wrap';
 const _assert: typeof exp._assert = exp._assert;
 
 export class Auth
-  implements compat.FirebaseAuth, Wrapper<exp.Auth>, _FirebaseService {
+  implements compat.FirebaseAuth, Wrapper<exp.Auth>, _FirebaseService
+{
   readonly _delegate: exp.AuthImpl;
 
   constructor(readonly app: FirebaseApp, provider: Provider<'auth-exp'>) {
@@ -107,12 +108,18 @@ export class Auth
   get languageCode(): string | null {
     return this._delegate.languageCode;
   }
+  set languageCode(languageCode: string | null) {
+    this._delegate.languageCode = languageCode;
+  }
   get settings(): compat.AuthSettings {
     return this._delegate.settings;
   }
   get tenantId(): string | null {
     return this._delegate.tenantId;
   }
+  set tenantId(tid: string | null) {
+    this._delegate.tenantId = tid;
+  }
   useDeviceLanguage(): void {
     this._delegate.useDeviceLanguage();
   }
@@ -348,7 +355,7 @@ export class Auth
     return this._delegate._delete();
   }
   private linkUnderlyingAuth(): void {
-    ((this._delegate as unknown) as ReverseWrapper<Auth>).wrapped = () => this;
+    (this._delegate as unknown as ReverseWrapper<Auth>).wrapped = () => this;
   }
 }