Hi Louis
Since you've already tried common fixes such as WSReset, signing out/in, and reinstalling the Microsoft Store, this may be an issue with the Game Pass promotional entitlement on the device rather than the Store itself.
Please check that:
- You're signed in to Windows and the Microsoft Store with the same Microsoft account.
- Windows is activated.
- Microsoft Store and Windows are fully updated.
If the "Get product" button continues to load indefinitely, you'll need to contact Microsoft Support, as only they can verify whether the bundled 3‑month Game Pass offer is correctly attached to your device and account. The community forum cannot access or check promotional entitlements.
Contact support here: Microsoft Support
Hope you'll get this sorted out!