Hello Myles Ravenscroft,
I understand you're having trouble redeeming the Game Pass offer included with your laptop.
To help narrow this down, could you please check the following?
- Open Microsoft Store > Library > Included with device. Is your Game Pass offer still listed there with a Redeem or Claim button?
- When you select Redeem, does the error appear immediately, or does it happen when you're asked to add or confirm a payment method?
Let me know what you find.