Mind sharing some details about your server?
I wasn’t even aware you can trigger a server update through Plex for Android / Android TV – then again… this is probably not an issue of the client itself. However… if your client cannot access the server because it’s outdated, you apparently haven’t updated that server for quite some time.
From what I could find, Plex for Android 8.8.0 has increased the minimum supported Plex Media Server version to 1.15.2. This version of PMS has been released in March 2019 (18+ months ago).
There might be other dependencies that could interfere with the update of your server (e.g. if your NAS operating system does not support newer versions of PMS).
