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It is playable in all region. 
Here is the concept: 
PS4: https://www.youtube.com/watch?v=UfBdDhAC50E&t=1s 
PS5: https://www.youtube.com/watch?v=5-G-PmNaDXc 

Difference between Primary and Non-Primary 
Primary = Trophy = Can be played in your main account 
Non-Primary = Non-trophy = Can only be played on the account that is given = less 50 Php