Authorization issue in Apple Music

I am trying to watch music videos that I purchased several months ago. I've never had a problem viewing them before, but now there is a pop-up that says "This computer is not authorized. Would you like to authorize it?" I enter my password and click on "authorize" and it says "This computer is already authorized." When I try to press play again, the same pop-up "This computer is not authorized" appears on the screen. This is very frustrating as I cannot play some of the videos that I have purchased. Music files don't have this problem. They are all on the drive. I fixed permissions. Deactivated the computer, logged out, restarted, signed back in, reactivated and some videos still will not play. How do I fix this? I only have 3 of the 5 allowed computers authorized