Hi Bill Waldron,
It seems you're having trouble logging in because the device is marked as missing. Since logging in works from a Private Window, there could be a few possible causes. Here are some steps you can try:
- Clear Cache and Cookies: Occasionally, issues can be caused by your browser's stored data. Please clear your cache and cookies, then try logging in again.
- Different Devices or Browsers: If possible, try accessing the system from another device or a different browser to see if the issue persists.
- Run Windows Update Troubleshooter: Settings > System > Troubleshoot > Other troubleshooters > Windows Update > Run. This fixes common update issues
- Device Registration: Check if the device is properly registered in your account settings. If not, you may need to re-register it.
- Device Health: Make sure the device status is Online before starting the update. Checking device health during the update can help avoid any issues.
- Reboot the Device: After making changes or updates, restarting the device can often help fix any remaining issues.
Documents:
Device Update troubleshooting guide
I hope the above helps. Please let us know if you have any further questions on this.
Thank you!