Same for me, and Epic’s support tells nothing.
“Unfortunately, we are unable to provide specific details about why the trader verification failed because verification is handled by a third party.
Please ensure that the document you provide for verification contains at least Street Address, City, and Country, as well as any other applicable information.”
But it fails even if I copypaste my address into the form from the document I upload. Currently I’m seeing the same error message and no form for attachment.