Plex stopped Scrobbling

For some reason, my last recorded scrabble onto Trakt from Plex was on Dec 31st.
I did have both the plugin and Webhooks turned on and have now removed the plugin. The Webhooks does not appear to be doing anything…
Any thoughts.
I Get a 415 error when trying to load the Webhooks if that makes any sense…
Sorry, bit of a novice at this though have been using plex and tract for years. Normally just start it up and let it go…

now I seem to have a 504 error…
Jan 04, 2021 18:37:36.442 [0x700004d24000] DEBUG - HTTP 504 response from POST https://scrobblers.trakt.tv/plex/
Jan 04, 2021 18:37:36.442 [0x700004d24000] WARN - Webhook: Error delivering payload to https://scrobblers.trakt.tv/plex/