Issue following blog post on NestJS setup

I’m working through this blog and ran into an issue with the login prompt that I didn’t see mentioned in the blog topic which is now closed.

The first issue was
unauthorized_client: Callback URL mismatch. is not in the list of allowed callback URLs

The blog only says to set Allowed Callback URLs to but I also added I also needed to add to the Allowed Web Origins.

Finally I was able to create an account, but then when attempting to login the popup is blank, and upon viewing browser (firefox) console I see Failed to execute ‘postMessage’ on ‘DOMWindow’: The target origin provided (‘’) does not match the recipient window’s origin (‘’).

I’m not sure what to do at this point.

@dan-auth0 Do you have any idea what could be causing the second error?

I´m having the same problem.