firebase auth => auth/captcha-check-failed and "Hostname match not found" errror

Question

I am getting the following message when trying to use auth.linkWithPhoneNumber(). All other auth services on the same domain are working fine.

auth/captcha-check-failed and "Hostname match not found" errror

https://github.com/firebase/quickstart-js/issues/394

Now I know this issue is reference all over but the solutions are not working for me... The solution i keep finding is to update Authorized Domains however there are 2 reasons that might not be the solution for this app.

1. All other auth services are working just fine
2. I am unable to change anything under Authorized Domains.

Login by phone DOES work on localhost, but not in prod

When updating Authorized domain the changes do not save. instead i get the following

Error updating authorized domain list

Question

If the solution for the auth/captcha... is to update domains then why cant i save changes there? If that is likely not the solution then do you know what it could be

Answer 1

I added my domain in the Authorised domain like if my domain is www.example.com i added example.com but it's not working so i try Adding with www.example.com and it worked for me. Add www.example.com instead of example.com