Hi @german1 ,
I don’t think the issue is with the callback mismatch. A few members had a similar issue ad the reason were outdated packages. Here’s a topic for reference.
I am using the repo associated with this doc for a Single Page App.
For the URL you can use any specific single subdomain URL.
To test it, it’s enough to send an /authorize request (an example below) with a redirect_uri param set to any specific single subdomain url (in the request neither in your app code do not use any wildcard; wildcard only in Auth0 tenant’s settings for a specific app like https://*.google.com/domains/) to initiate the login flow and once authenticated, to be redirected to your page.
https://{your_auth0_domain}.com/authorize?client_id={xxx}&scope=openid+profile+email&redirect_uri={url}&response_type=code
Hope this helps!