Hi,
Thank you for posting in Microsoft Q&A forum.
1,Please try .\administrator as username.
2,Please check the Event log to see if there is any useful information. Windows LAPS logs can be found in the Windows Event Viewer at Applications and Services Logs > Microsoft > Windows > LAPS.
Windows LAPS troubleshooting guidance
3,Also you can create a new administrator account for LAPS and disable the built-in Administrator account to have a try.
For more information, please refer to:
WINDOWS LAPS MANAGEMENT, CONFIGURATION AND TROUBLESHOOTING USING MICROSOFT INTUNE
Configure Windows Local Administrator Password Solution | Enable Windows LAPS | Microsoft Cloud LAPS
Thanks for your time. Have a nice day!
Best regards,
Simon
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