Plex "Config flow could not be loaded: 500 Internal Server Error Server got itself in trouble"

Hi
On our kitchen tablet we listen to music and can see/control the track via the HA dashboard.

Since moving our Plex server to a new host (from NAS > MiniPC/Proxmox) I noticed that it’s sometimes slow to pickup changes. But today, it’s not updating at all.

When going to the integration and trying to see the config to make sure all was ok I got the error pop-up

Config flow could not be loaded: 500 Internal Server Error Server got itself in trouble

What it thinks I’m playing - HA Dashboard:
image

What it’s actually playing (for the last 30mins) - Tautulli:
image

In the DevTools area I see that that media_position_updated_at is probably around the time I skipped to the next (current) track. I used the HA dashboard media player to do it. Which it did, no problems.

volume_level: 1
is_volume_muted: false
media_content_id: 153897
media_content_type: music
media_duration: 5323
media_position: 123
media_position_updated_at: 2024-08-31T13:12:23.681293+00:00
media_title: ANFISA LETYAGO at LOVELAND FESTIVAL 2024 • AMSTERDAM
media_artist: Various Artists
media_album_artist: Various Artists
media_library_title: YTMusic
player_source: PMS
username: redacted
entity_picture: /api/media_player_proxy/media_player.plex_redacted_plexamp_android?token=20394820398402&cache=2309482039482039
friendly_name: Plex (Redacted - Plexamp - Android)
supported_features: 152127

I just did a reload of the integration and it immediately picked up the correct track and position.
But I still have the 500 Internal Server Error pop up if I try to see the config.

I could delete/re-add, but would like to know what may be causing the error.
When I migrated my Plex Server from our NAS > Mini PC (Proxmox LCX) I changed the IP, but it’s the same /24 VLAN. The move was seamless and nothing else has changed.