Its one of the challenges that seriously doesn’t seem to have an easy solution. Like the closest I can think of is a centralized authority that the service can send a identity verification request to that, then the user can sign into the centralized authority and confirm “yes I am the person you requested to verify”

This would also help with annoying employment verification where I have to bring every document needed to steal my identity to my new employer for them to scan and digitally store indefinitely then return said documents to my safe