@Morningstar42 said:
401 error on retrieval.
Working from a Web Sources script in mp3tag.
Search function is working properly, (So I am reasonably sure that it's not something up with API token)
But when it goes to pull data it throws a 401 error at me.
Code is:
[AlbumUrl]=https://api.themoviedb.org/3/tv/
json_select "id"

  SayRest

  Say "/season/TVSEASON/episode/TVEPISODE?append_to_response=api_key=xxxxxxxxxxxxxxx&language=en"

Your API Key cannot be a parameter of &append_to_response=.
&append_to_response= should be used for additional data in a basic data search.
https://developer.themoviedb.org/docs/append-to-response

I don't know what data you want from the episode.
https://developer.themoviedb.org/reference/tv-episode-details
I assume that in addition to the Basic Data you also want the Credits.
If it's the Credits then your API Request should be written like this:

https://api.themoviedb.org/3/tv/4614/season/14/episode/6?api_key=THE_KEY&language=en-US&append_to_response=credits

You can also fetch only the credits directly.
https://developer.themoviedb.org/reference/tv-episode-credits

https://api.themoviedb.org/3/tv/4614/season/14/episode/6/credits?api_key=THE_KEY&language=en-US