I have a FB account with a Quest 2 headset linked. I bought my Grand daughter a headset for Christmas. I see that i can add a headset to my oculus account which by default will use my FB account. If I do this will the headset have its own ID, Meaning if i am in alcove, can i invite my grand daughter over to play drafts etc...
But in general you won't be able to play multiplayer as most games only allow one license per player. Beat saber you need 2 accounts and 2 purchases of beat saber.