Merged accounts access

So i have both PS5 account and poe client account i have merged them in a single account (login)
Tried to play with family but everytime i login in one platform it logs out from the other.

Is there a way we can play together?

Can i unmerge/ change the login of one account so I don't face this issue?

Thanks

No, they are now 1 account, and you cannot "un-merge" nor can GGG unmerge it for you. Only way is to create a new account and re-purchase early access on the new account.