How to fix error error-invalid-sub-authority in Windows 11

Solution Steps

1. 1 First, try restarting your computer. Sometimes a temporary glitch can cause this error. If it persists, proceed.
2. 2 Open Command Prompt as administrator. Type "sfc /scannow" and press Enter. This scans and repairs corrupted system files. Wait for it to complete (may take 15-20 minutes).
3. 3 If SFC doesn't fix it, run DISM: type "DISM /Online /Cleanup-Image /RestoreHealth" and press Enter. This repairs the Windows image. This can take 20-30 minutes.
4. 4 If the error is related to a specific application, reinstall that application. Uninstall it via Settings → Apps → Installed apps, then download the latest version from the official website.
5. 5 Check the registry for invalid SIDs: Press Win+R, type "regedit", and navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList. Look for any profile keys with a long SID-like name. If you see one that doesn't match any user, you can delete it (after backing up the registry).
6. 6 If the issue persists, consider creating a new user account and migrating your files. Go to Settings → Accounts → Family & other users → Add account, and set up a new user.