Hi, Federico,
You can have a try with PowerShell. For all Office 365 services (including OneDrive For Business, Delve, and SharePoint Online), you can change the language and region settings at the user level in a Cloud identity or Synchronized identity model by
using Office 365 PowerShell.
To sync the settings by using a user ID, run the following example cmdlets after you substitute the actual values:
Get-MsolUser -UserPrincipalName user1@contoso.com | Set-MsolUser -PreferredLanguage "it-it"
Get-MsolUser -UserPrincipalName user1@contoso.com | Set-MsolUser –UsageLocation IT
More Information: https://docs.microsoft.com/en-us/office365/troubleshoot/access-management/set-language-and-region
Don't forget to
connect to Office 365 first.
Best Regards
Jerry
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