Hello First,
Thank you so much for posting in Microsoft Community.
I appreciate you raising this concern to us, and I understand that you're having issues with pairing your Pen to your Surface. You got me here: we'll isolate this issue together.
If the LED light on the pen is turning on when you place it in the charging station, it means that the pen is receiving power. However, if the pen is not turning on when you press and hold the power button, it could be a hardware issue.
But there are a few things you can try to troubleshoot the issue:
- You may try running the Surface Diagnostics Toolkit.
- Download Drivers and Firmware: Download Surface Pro 7 Drivers and Firmware. from Official Microsoft Download Center
- If any case, you have other Surface try to pair the pen and see if that fix the issue.
- As you mentioned, you may also try wait until the Windows 11 successfully installs and maybe that will fix the issue.
Let me know how it goes.
Best wishes,
Rolando S.