App keeps failing TestFlight review because of geo-restricted content

I'm building an app which exposes a third-party service which blocks logins from the US for legal reasons. This means that they are unable to provide a whitelisted account, even for test purposes, which will work from a US ip address.


All my recent builds have failed due to this reason, even though my earlier ones did not. I feel like there has to be some mechanism on Apple's side to accommodate services which have to remain geo-restricted, even in TestFlight.


Has anyone had a similar experience?


Thanks