may different sessions for the same user active (plesk active sessions -> kill those & may service sw-cp-server + sw-engine + nginx restart), had similar troubles today but it was working afterwards, but I don't know if it is solved or not to 100%
cheers Michael
I rebooted my server multiple times and there were no active sessions.
Which extensions are you using? Could one of them cause the issue?
action-log - Action Log
broadcast-message - Broadcast Message
composer - PHP Composer
configurations-troubleshooter - Webserver Configurations Troubleshooter
dnssec - Plesk DNSSEC
firewall - Firewall
git - Git
google-authenticator - Google Authenticator
grafana - Grafana
heavy-metal-skin - Skins and Color Schemes
hp-exporter - Hosting Plan Exporter
letsencrypt - Let's Encrypt
monitoring - Advanced Monitoring
nodejs - Node.js
panel-ini-editor - Panel.ini Editor
panel-news - Plesk News
permissions-recursive - Permissions Recursive
plesk-mobile - Plesk Mobile Center
repair-kit - Repair Kit
ruby - Ruby
site-import - Site Import
social-login - Social Login
ssh-keys - SSH Keys Manager
sslit - SSL It!
syslog-watch - Syslog Watch
traffic-monitor - Domain Traffic Monitor
watchdog - Watchdog
wp-toolkit - WordPress Toolkit
I tried disabling them with CLI, but the problem was still there so I enabled them again.