Hi Ben,
Stop wasting time with domain rejoins and Intune syncs. Error 0x8028009f is strictly a local hardware/crypto issue. It means the local Windows Hello key container is corrupted or the TPM chip is locked up.
Here is the exact way to fix this locally without rebuilding the machine:
1. Nuke the corrupted Hello Container: Open Command Prompt as Administrator on the affected machine and run this exact command: certutil.exe -DeleteHelloContainer Reboot the machine and ask the user to set up the PIN again. This fixes the issue 90% of the time by clearing out the corrupted local cache.
2. Clear the TPM (If Step 1 fails): If the TPM itself is stuck or locked out, you must wipe it.
Suspend BitLocker first (this is critical so you don't lock them out of the drive).
Press Win + R, type tpm.msc and hit Enter.
Click Clear TPM... on the right-hand Actions pane.
Reboot the machine (the user may be prompted to press F1/F12 on the BIOS boot screen to confirm the TPM clear).
Once the TPM is fresh, Windows Hello will finally accept and save the new PIN. If this resolves your issue, please click "Accept Answer".
Tracy.