Valid TVDB entry not found in skyhook/sonarr

Sonarr version (exact version): 4.0.12.2823
OS: FreeBSD 13.3

Attempting to add tvdb: 345859 (Star Trek: Section 31). A quick lookup at https://skyhook.sonarr.tv/v1/tvdb/shows/en/345859 returns:

{“message”:“NotFound”,“description”:“thetvdb.com does not have a series with the tvdbid 345859, it may have been removed.”}

Despite an seemingly valid entry in the TVDB, from where the ID was copied.

Advise?

It’s a movie, not a TV series you’ll want to add it to Radarr, not Sonarr.