error [7ita9]

Hi Giancarlo, welcome in community

first step:

Press WIN + X and open terminal as admin, then type

   if (-not (Get-AppxPackage Microsoft.AAD.BrokerPlugin))
                { Add-AppxPackage -Register      "$env:windir\SystemApps\Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy\Appxmanifest.xml" - 
   DisableDevelopmentMode -ForceApplicationShutdown } Get-AppxPackage Microsoft.AAD.BrokerPlugin

then re-try, if without success -->

second step:

1. Press Windows + R, type control, and press Enter
2. Navigate to User Accounts > Credential Manager
3. Remove any credentials related to your Microsoft account

re-try again, if without success -->

third step:

Delete temporary files of Outlook:

1. Go to C:\Users\<YourUsername>\AppData\Local\Microsoft
2. Delete contents of the IdentityCache and OneAuth folders

re-try and let me know

Elvis

The error message "An unexpected error occurred" indicates that an unanticipated issue has arisen, which can be caused by various factors. To address this, you can try the following steps:

1. Restart the System: Sometimes, simply shutting down and restarting your system can resolve unexpected errors.
2. Check Disk Space: Ensure that you have sufficient disk space available, as low disk space can lead to unexpected errors in applications.
3. Contact Support: If the issue persists, consider noting the error code (3399811147) and contacting Microsoft Technical Support for further assistance.

These steps should help you troubleshoot the unexpected error you are experiencing.