I did a bit of digging in the plex agent logs, as plex can’t grab posters, but gets the info.
Sonarr grabs both things right.
What i noted was this:
I am using Succession (2018) as an example.
2018-06-05 13:06:09,278 (7f31f0ff9700) : DEBUG (networking:166) - Requesting 'https://thetvdb.com/banners/episodes/338186/6666566.jpg'
Grabbing episode poster, success.
2018-06-05 13:06:10,059 (7f31cf5e7700) : ERROR (networking:219) - Error opening URL 'https://thetvdb.com/banners/' 2018-06-05 13:06:10,059 (7f31cf5e7700) : INFO (__init__:1070) - HTTP Error 403: Forbidden
Grabbing poster, ERROR.
Looking at the url, the poster is placed on, at thetvdb, this seems off.
And the banner is here:
Manually going to thetvdb.com/banners/posters, lists EVERY single poster, on that site.
Could it be the agent, looking in the wrong folder?
(Maybe they changed the api, to separate posters/backdrops etc)
Just a thought.