Anyone else come across this?

I go to add a player to an existing sonos system.

The system is registered to an email the customer does not recognize.

Unfortunately, both the Sonos desktop controller and Sonos app are not giving the option that used to be there that said: "I no longer have access to this email".

It insists on making me try to sign in with the mystery email, which is unknown.

Anyone else have to troubleshoot this lately?