When I try to login on it switches back to the login page with an empty error field. When login into the setup I can access the header admin page and the setup menu, but as soon as I choose any option, it switches back to the login page.
The system at the backend is still working with WebDAV/CalDAV.
Version is 23.1.20230620 installed on a shared webhost using Softaculous.
PHP version is 8.1
4 Weeks later and still no response/solution
I can login into the setup screens, but no matter which link I touch, it automatically defaults back to the login screen without any error messages.