@leokhan the first time you installed it was working and only creating issue on operator login?

After that time you are no more able to setup a clean install of UVdesk?

I'm very sorry for all this issues.
What version of PHP are you using?

Be sure to use a supported PHP version: https://www.php.net/supported-versions.php

Be sure also to have not some custom rules in .htaccess that can cause the login issue.

Unfortunately I'm not a developer and I'm not part of the UVdesk team. I'm just a passionate user who use UVdesk and helps here in the community!
Since some weeks seems UVdesk staff is no more present on the forum so we are missing help from UVdesk staff and developers. We hope all together someone of the UVdesk team can come back on the forum to reply to post and to help users. This should happen but I have no eta, no idea about when will be.