How to change particular Regional Settings for all users in office 365 at one shot

[Sreedhar_K]

How to change particular Regional Settings for all users in office 365 at one shot

[#2]

You can use the PATCH /regionalAndLanguageSettings method from the Graph API:
https://learn.microsoft.com/en-us/graph/api/resources/regionalandlanguagesettings?view=graph-rest-be...

Or the corresponding Update-MgUserSettingRegionalAndLanguageSetting cmdlet from the Graph SDK for PowerShell.

[#3]

@VasilMichev 

Thanks. 

How do you use Graph API? I'm not aware of.

Or is there a menu setting or a PowerShell command to set the default region?

[#4]

I gave you the PowerShell cmdlet above.