I checked the error logs on the domain providers console and found many error logs, the last one is this:
[Tue Oct 29 18:07:13.855383 2024] [access_compat:error] [pid 998105:tid 998628] [remote 89.160.57.33:65093] AH01797: client denied by server configuration: /home/focusart/bkkovotrade.sk/wp-login.php, referer: https://kriesi.at/

Tomorrow I will contact the provider to solve this. Didn´t find anything blocking in .htaccess file.