Server Version#:1.23.2.4656
Player Version#: 8.18.2.258.250
Weird. Just out of the blue I get an error “User could not authenticate” on my server with just my account on any Android device. Signs in on web just fine. Changed my password just in case and still getting the error. Setup Plex on wife’s phone and tried that with same error. Tested daughter’s tablet with my account, same error. Pixel 4, pixel 3 and a Galaxy tab all have the same issue.
I found an older article saying to delete all authorized devices including server (then reclaim) but this did nothing either. This must be one of the awesome Plex premium features! 