Revolut is misleading users making support requests by falsely claiming there's a compatibility issue with GrapheneOS. It's not true. They're banning using a non-Google-approved OS. If it was a compatibility issue with this widely used app, we'd have worked around it on our end.
In some of their responses, they claim they check for a Google-certified OS for security reasons. Can't be true, because they're permitting an OS which hasn't received security patches for the past 8 years. They're disallowing a much more secure OS than anything Google approved.