I don’t know if this has anything to do with the problem, but when I was making a van for my game, I discovered that if a part a proximity prompt is parented to has a different CFrame on the client than it does on the server, the proximity prompt will show up on the client, but won’t be able to be triggered for the server.
You said it’s found, but did it print (just to clarify how you know it’s found).
Maybe make the door a model and export it to another blank baseplate to see if it works there.