firebase-ios-sdk Firebase MFA: isAppVerificationDisabledForTesting is not working

Step 0: Are you in the right place?

Having issue with isAppVerificationDisabledForTesting flag.

[REQUIRED] Step 1: Describe your environment

Xcode version: 13.3
Firebase SDK version: 8.13.0
Installation method: Swift Package Manager
Firebase Component: Auth
Target platform(s): iOS

[REQUIRED] Step 2: Describe the problem

I'm trying to write UI/Integration testing to login with with Firebase MFA where first step is login with email/password and second as phone number / OTP. When I set a flag Auth.auth().settings?.isAppVerificationDisabledForTesting = true after verifyPhoneNumber it throws me an error below.

Error Domain=FIRAuthErrorDomain Code=17042 "Invalid format."
UserInfo={NSLocalizedDescription=Invalid format., 
FIRAuthErrorUserInfoNameKey=ERROR_INVALID_PHONE_NUMBER}

I use fictional phone number +16505554567 / 123356 and added it to the test phone numbers section in Firebase console. I also tried to use real phone number. (didn't help)

Steps to reproduce:

Enable MFA in Identity Platform.
Enable email/password provider.
Enable phone number / OTP provider.
Add fictional phone number under test phone numbers - +16505554567 / 123356
Then create user with email/password.
Verify email
Enrol 2 step authentication as phone number / OTP - +16505554567
Then (on another device or simulator) enable Auth.auth().settings?.isAppVerificationDisabledForTesting = true
Login with email/password
Then try to complete required second step with +16505554567 Expected behaviour It should proceed and ask for OTP code. Actual behaviour It throws error:

Error Domain=FIRAuthErrorDomain Code=17042 "Invalid format."
UserInfo={NSLocalizedDescription=Invalid format., 
FIRAuthErrorUserInfoNameKey=ERROR_INVALID_PHONE_NUMBER}

Without flag Auth.auth().settings?.isAppVerificationDisabledForTesting = true it works as expected. Though it is not possible to write UI Testing due to reCaptcha.

Apr 02 '22 12:04 romansorochak

Thanks for reporting, @romansorochak. Is the issue only reproducible on UI/integration testing? I'm unable to get the same error using the Auth Quickstart (though I haven't tried on UI testing).

Apr 04 '22 20:04 rizafran

@rizafran Thanks. This issue appears when login with 2FA. It doesn't matter wether I try to perform steps below manually or with UI/Integration testing.

step is to login with email/password.
then as a 2 step trying to verify phone number

Auth.auth().settings?.isAppVerificationDisabledForTesting = true

PhoneAuthProvider.provider().verifyPhoneNumber(
  with: hint,
  uiDelegate: nil,
  multiFactorSession: multiFactorSession,
  completion: completion
)

in completion I receive error as below

Error Domain=FIRAuthErrorDomain Code=17042 "Invalid format."
UserInfo={NSLocalizedDescription=Invalid format., 
FIRAuthErrorUserInfoNameKey=ERROR_INVALID_PHONE_NUMBER}

Apr 05 '22 14:04 romansorochak

Hi, thanks for filing this issue! We are unable to promise any timeline for this, but if others also have this issue, adding a +1 on this issue can help us prioritize adding this to the roadmap.

(Googler-only internal tracking bug: b/228617084)