Sorry for the delay. I checked the server responses, but nothing strange to find…
The only weird thing I found is the referrer of the GET request after logging in and showing the “authentication failed” message:
GET /wp-admin/admin-ajax.php?action=wwa_auth_start&user=olli&type=auth HTTP/2.0" 200 723 "https://www.xxxxxxx.de/wp-login.php?loggedout=true&wp_lang=de_DE" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/118.0
Why is ‘loggedout’ set to true?
And again: after this “unsuccessful login”, I am definetly loggin in as I can access the WP Dashboard just by opening the “…/wp-admin” URL.
How can I debug further?
Thanks for your help,
Olli