You provided the XML for Fisher King. I assume that means this did not merge and you have 2 copies of this shown. I wanted the XML from both of these un-merged movies so I could confirm that they were using the same agent. If they are using different agents, then it is expected that you will not be merged.
I don’t know how that happened. Even if somehow the agent got changed for a library, it won’t change the agent used to match a movie. That is set unless you Plex Dance it after changing the default agent or you do a manual match and pick a different agent.
If somehow this was done and all your movies got changed to the Plex Movie agent and you want to use TMDB, you will need to change them all back manually before adding the new one so the merge will work. There is no quick way to do this. You either need to Plex Dance the entire library or manually rematch each movie.
Try manually editing the DB instead. Much quicker. [HowTo] Plex database modification - Moving media the right/wrong way - #43 by sleepdepd_gmail.com
