Hi Rob Buttarazzi,
Since the Surface Pro X is designed to support Windows 11 on ARM, one thing worth checking is whether the device is fully updated with the latest Surface firmware and drivers before attempting the upgrade.
As I have checked and validated, the approach from AI answer has pointed us in the right direction, so you can follow to see if it works.
Regarding that Windows Defender is not loading properly on your Surface Pro X, it may be worth checking the Windows Security service before focusing on the Windows 11 upgrade. Please try these quick checks:
- Press Win + R, type
services.mscand press Enter. - Locate Security Center and Microsoft Defender Antivirus Service.
- Make sure they are running and set to start automatically.
- Restart the device and try opening Windows Security again.
You can also run the following command in an elevated Command Prompt to check for corrupted system files: sfc /scannow
After any issues are repaired and all updates are installed, check Windows Update again to see whether the Windows 11 upgrade is offered for your Surface Pro X.
If Windows 11 still is not being offered after all available updates are installed, please let us know if you receive any specific error messages in Windows Update. That information can help narrow down whether the issue is related to update eligibility or another update component.