Hi there, I'm Arlene, an independent advisor, thanks for reaching out.
That white screen issue after using Revolut is a known issue sometimes with Microsoft Store.
Can I ask if you've tried redeeming the Game Pass directly on the Microsoft Services page instead of through the Store app?
I recommend redeeming offers through the web if the Store app has issues and also making sure Windows and the Store app are updated. If the problem continues, try clearing the Store cache by pressing Windows + R, typing wsreset, and hitting Enter. If Revolut still doesn’t work, using a different payment method just for the setup might help complete the redemption.
Let me know if that works!
Regards,
Arlene D.