I also created my Spotify account with Facebook. When I wanted to unlink them I just sent an email to support and they did it pretty quickly with no issues. I h

I also created my Spotify account with Facebook. When I wanted to unlink them I just sent an email to support and they did it pretty quickly with no issues. I haven't used FB and Spotify for years now, so things might have changed, but OP should try and do the same.