For online accounts (ignoring devices that you can physically access) what happens when the account is in your name, but you do not have access to it? Ie: Hugh

For online accounts (ignoring devices that you can physically access) what happens when the account is in your name, but you do not have access to it? Ie: Hugh Jackman has an Instagram account, but it may be run by his PR team. He doesn't hold the password to it, and depending on the contract terms, may have no capacity to order his PR firm to provide it. Non-celebrities could start structuring their online identities in a similar manner, as separate legal entities that afford them (as an individual entity) limited rights. The border guards could still reject your entry tho.