Repair corrupt AzureAD profile

Hello,

     I have a client with a user for whom we recently synced a device to AzureAD. Now that user's Outlook is perpetually prompting for password. Trying to build a new Outlook profile did not help (unable to set up automatically (M365)) and resetting her Microsoft 365 password did not help. I'm told that rebuilding her AzureAD profile, or more to the point building her a new one, has fixed the issue for others, but there is no clear path/process on how to do this. Any guidance is welcome.