Plex for Kodi No Servers Found after Server Upgrade

Server Version#: 1.32.5.7349
Player Version#: 0.3.5 in Kodi Repository

After upgrading my debian server at home to debian 12 and reinstalling plex media server, my plex for kodi addon does not find the server anymore.
The server is up running and I am able to watch via the browser interface in my lan or outside.
The plex for kodi addon worked after the upgrade a couple of hours. At the first time the addon did not find my server I restarted the plexmediaservice.service on the debian machine and the plex for kodi addon found it. I streamed a couple of days later outside of my network with the web interface and since then being back home the server is not found anymore. Restarting the service did not help.
Where can I look to narrow a solution?

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