When you transfer a name, you tell my.box where it should go. You can enter more than a raw wallet address, and this article explains what is accepted and how it is checked.

In the recipient field you can use any of these:

If you enter a name rather than an address, my.box looks it up on Ethereum and resolves it to the wallet address behind it. It checks as you type, so you see whether the name resolves before you continue.

A .box or ENS name only works as a recipient if it points to a wallet address. If a name has no address set, my.box cannot tell where to send your name, so resolution fails and you will need to use a different recipient (or the wallet address directly).

If the recipient cannot be resolved, you will see a message asking for a valid wallet address, .box name, or ENS name before you can continue.

my.box will not let you transfer a name to your own connected wallet.

Beyond that, double check the address. A transfer is permanent and cannot be reversed, so it is worth confirming the resolved address is the one you mean before you confirm.