Authorization

dear sirs,

I had a crash and change the logic board of my MacBook Pro (2018).

after installed everything and iCloud and iTunes Match working fine, I tried to rent a film on Apple TV and it says that I have already 5 computers authorized and cannot authorize my MacBook pro.

in fact I have only 2 computers authorized and 2 iPhones, 1 iPad and I iPod.

maybe these authorisations can be of older computers that I don't have anymore.

how can I see which computers are those and/or what to do?

thanks,

Jose