UI Error handling not the same during sign up and sign in

[MrVentzi]

[REQUIRED] Describe your environment

• Operating System version: Windows 10
• Browser version: Chrome Version 92.0.4515.107 (Official Build) (64-bit)
• "firebase": "^8.6.8",
• "firebaseui": "^4.8.0",
• "gcip-iap": "^0.1.4",

[REQUIRED] Describe the problem

Steps to reproduce:

1. Create a firebase ui app
2. Create a blocking cloud function - e.g. check if the email is verified, and throw error if not
3. Throw error during login with custom message

throw new gcipCloudFunctions.https.HttpsError('permission-denied', Please verify your email before proceeding.);

Tried the process in 2 flows.
During sign up:

1. Sign up with new user
2. Error is shown as expected
   
   console error here: [ 16.665s] [firebaseui] setAccountInfo: {"code":"auth/internal-error","message":"Please verify your email before proceeding."}

During sign in:

1. Sign in with the new user
2. Error is not handled correctly
   
   console error here: [104.998s] [firebaseui] verifyPassword: HTTP Cloud Function returned an error: {"error":{"code":403,"message":"Please verify your email before proceeding.","status":"PERMISSION_DENIED"}}

Let me know if you need anything else.

Would appreciate if you have a workaround to fix the UI in the meantime?

[xil222]

filed a internal bug to track b/194807579
will fix it soon