Hi all, I have a problem accessing Power Pages. Let me explain the situation better, I have two environments: a development environment (sandbox) and a production environment.
In the development one everything works correctly and I can access the homepage after the Microsoft login, in the production one however not, after the login I get redirected here (https://site.com/Register?ReturnUrl=%2F😞

I checked everything I could check and there seems to be no difference between dev and prod.
As you can see, the page is set to be seen by everyone. Also in the preview below you can see that the page is there.

Identity providers (same in dev and prod):

The permissions table is empty in both dev and prod, the site is public in both environments.
Attached you can find the excel extracted from Site Setting, even there I see no discordance.
I noticed a very strange behavior doing the tests. If I create a new test page:
- In dev it stays and I can see it normally
- If I do it in prod instead the page creates it at the moment, but then on refresh of the builder page it is as if it never existed and is nowhere to be seen.
Frankly, I wouldn't know what else to look at. Thank you for your help.