Server Version#: 9.1.1 (is that the correct info)?
Player Version#: 1.41.3.9314
<If providing server logs please do NOT turn on verbose logging, only debug logging should be enabled>
Plex has become unavailable outside of my home
Probably occurred when we switched from virgin to sky (new router etc)
Also a PS5 in the home, connected to wifi will not play media on the plex app, it connects, displays the content, tv and movie thumbnails etc, but will not play any programs
I am not saying it is this but it might be worth going in to Plex > Settings > Network and seeing if the Enable server support for IPv6 is checked and seeing if that helps.
I am assuming that you have set a DHCP reservation in the router for your server, and have opened port 32400 on it.
One thing I have also done on my server (under remote access) is manually specified the public port… I have set it to 32400 (default) but without that for some reason the outside world was saying it was offline.
You might also check your local IP ranges too, the PS5 should have been able to connect locally. the most common issue is that you are not using standard IP addressing or are on different subnets.