How can I be added to multiple Amazon EU accounts without re-uploading docs?

I’m working on multiple Amazon seller accounts. To make this work, sellers invite me to their accounts.

This worked fine for the Amazon NA accounts. But then, with Amazon EU, Amazon requested my national ID to be uploaded. So I did (actually, the first seller had to do it), and it worked.

But then another seller invited me to their EU account, and Amazon requested it again, asking this new seller to upload my national ID. I thought one validation would be once and done. More than that, Amazon leaked my personal information to this new seller, displaying my ID and expiration, while asking this new seller to upload my documentation.

How are you all working with multiple EU accounts?

There’s also the Authorized Partners path. Is that correct to be added to multiple accounts?