Originally Posted by
DevilDoughNutt
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If it says "One-time license fee for play on account’s designated primary PS4™ system and other PS4™ systems when signed in with that account." in the expansions description, then yes.
I am assuming you have both accounts A & B on one PS4 and that PS4 is set as the primary PS4 for acc A
Acc B should be able to share the expansion just like the main game as long as it is played on acc A primary PS4. Assuming you buy expansion for acc A like the main game.
But if you log into another PS4 as account B you will not be able to play either the main game or expansion if not purchased for acc B too.