Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello Dipin,
May I know if this user is using Outlook Web App(OWA)? If yes, it is suggested to try to change the setting via other network connections. For example, you can let the user change it when he is at home.
If the issue persists, you can run the PowerShell command to set the language and time zone. You can see the following steps:
- Connect to Exchange Online PowerShell.
- Run the following command to set the language and time zone: ***Set-MailboxRegionalConfiguration -Identity ***@contoso.onmicrosoft.com -TimeZone "GMT Standard Time"
Note: Please change the value of the identity and time zone by yourself. If you don’t know the value of the time zone, you can run ***Get-MailboxRegionalConfiguration -Identity ***@contoso.onmicrosoft.com | flfor a normal user. It will list the current time zone for this user.
Meanwhile, here is an article for your reference: Set-MailboxRegionalConfiguration.
Regards,
Rick