Remote access suddenly only working over mobile network, not over home network

Server Version#: 1.32.5.7349
Player Version#:
Windows 11 as server
Plex lifetime pass owner

I have remote access enabled over a manually specified port. Plex says its fully accessible outside of my network.

Everything was working great for months/years. Two days ago we had a power outage and my Server/Internet shut down unexpectedly. Afterwards remote streaming was not working at all - unsecure error.

Every setting is still the same, Ports Firewalls etc. Rebooted server and network a couple of times.
Remote streaming works via browser if I open mypublic-ip:port to plex.

When clicking the Plex tray icon, Plex would not come up but a page “Unauthorized 401”.
I figured out that the token was not valid anymore, I reset my password, but still - I had to uninstall and install Plex Media Server on the Server again for the token to be valid. Now I could open it.

Now remote streaming is working over mobile network but not on three different home networks. Same error.
I tried changing the DNS on the server but it did not help.

Plex Media Server Logs_2023-08-25_10-04-01.zip (3.2 MB)
Plex Media Server Databases_2023-08-25_10-16-00.zip (6.6 MB)
Diags attached.

Edit: So it works via my Home wifi as well, but I have to strictly disable only secure connections in each app…but why?

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