My client has been booted from App Store Connect

My client was apparently setup as an internal tester, and they got a message that their App Store Connect account had been deactivated for reasons unknown.

Apparently to re-activate it, they have to provide "passport" info, which seems over the top.

I thought about setting them up as an external tester, but apparently this requires the app be reviewed by a person who would have no access to the app's login as it restricted to the client.

How can I proceed?

How can I proceed?

Very carefully. If your account is associated with a terminated account, you might be next.

Apparently to re-activate it, they have to provide "passport" info, which seems over the top.

Obviously I have no idea about your client or any of the details. But this is standard, and mandatory, "know your customer" industry practice.