"Sign in to your account" window opens briefly and just closes after 1 s again.

[marc40000]

If I click on Sign In a "Sign in to your account" window opens briefly and just closes after 1 s again.
There is no error message. What could cause this? How to fix this?

I installed the repo locally and included an entry iin hosts so I can use that instead of localhost to access the page. I replaced the content of the constants and set the scopes in azure. I have no clue whats wrong whatsoever and without an error message I don't know what to do about it.

Can someone help?