[auth] The resolver exposed in MFA is not associated to the correct app

[Lyokone]

Description

When getting the resolver from key "FIRAuthErrorUserInfoMultiFactorResolverKey", the resolver is associated with the default app name even though I signed in with an app name with a different app name.

first reported here: firebase/flutterfire#10275

Reproducing the issue

FIRAuth *auth = [FIRAuth authWithApp:app];

 [auth signInWithEmail:@"email"
               password:@"password"
             completion:^(FIRAuthDataResult *_Nullable authResult, NSError *_Nullable error) {
               if (error != nil) {
                 if (error.code == FIRAuthErrorCodeSecondFactorRequired) {
                   FIRMultiFactorResolver *resolver = (FIRMultiFactorResolver *)error.userInfo[FIRAuthErrorUserInfoMultiFactorResolverKey];
                   // here the resolver is associated with the wrong app name see screenshot

                 } else {
                   result.error(nil, nil, nil, error);
                 }
               } else {
                 result.success(authResult);
               }
             }];

Firebase SDK Version

10.3.0

Xcode Version

14.2

Installation Method

CocoaPods

Firebase Product(s)

Authentication

Targeted Platforms

iOS

Relevant Log Output

No response

If using Swift Package Manager, the project's Package.resolved

Expand Package.resolved snippet

Replace this line with the contents of your Package.resolved.

If using CocoaPods, the project's Podfile.lock

Expand Podfile.lock snippet

Replace this line with the contents of your Podfile.lock!

[google-oss-bot]

I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.

[ryanwilson]

Thanks for the report, looks like this is the offending line:

firebase-ios-sdk/FirebaseAuth/Sources/MultiFactor/FIRMultiFactorResolver.m

Line 47 in bdac2b8

_auth = [FIRAuth auth];

[koenmuilwijk]

@ryanwilson thanks for investigating this and pointing out the possible cause.

Any idea when a fix will be available? This is blocking us from releasing MFA as we are using a custom Firebase app in our app.