Own authentication service uses too late

Question

Once again I created my own authentication service. This is registered and is also called. After submitting the login form (EXT:felogin) you get back to the same page - but Felogin continues to show the login form. After a page reload, the logged-in state is recognized correctly and the status display is displayed. The same form works correctly with a normal, local FE user.

When debugging authUser() correctly returns 200.

What could that be?

Answer 1

Besides returning 200 by authUser(), having a valid FE-User (at least with uid, pid, username, usergroup) is necessary. My FE-User was broken.

TYPO Documentation - Authentication services:

One important thing to know is that the TYPO3 CMS authentication process needs to have users inside database records (“fe_users” or “be_users”).