Firebase Email verification not working with ActionCodeSetting and dynamic link

[cayceP]

Hi,

I am trying to implement verification of the user's email (with the default verification URL in the email template), AND an ActionCodeSetting dynamic link to bring the user back to the app after verification.

What I have tried:

I tested the email verification with the automatically generated email verification link. It worked.
I then added an ActionCodeSetting URL that uses a domain that is added to the Associated Domains of the XCode project. This worked to bring the user back to the app after clicking the verification link. 

Problem: the email verification no longer works after adding the ActionCodeSetting url (which is a dynamic link configured in the Firebase console). It also causes an extremely long and garbled combination of the dynamic link URL and the default verification URL.

I have outlined my problem in more detail on stack overflow. Any suggestions are greatly appreciated. I am thoroughly stuck.

https://stackoverflow.com/questions/51178015/firebase-email-verification-not-working-with-actioncodesetting

[cayceP]

Super helpful answer here: https://stackoverflow.com/questions/51178015/firebase-email-verification-not-working-with-actioncodesetting