A common issue with Dynamics 365 / Dataverse is that the user timezone default doesn’t always match what your users expect. One option is to use the XrmToolBox to update user timezone, or to ask all new users to change their preferences in the personalization settings.

However we can also do this with a Power Automate flow, either triggered against the user record – hey you could automate more than just this part of the user setup. Or an ‘on create of user’ cloud flow.

It’s the User Settings table that you need to update (usersettingsconfig is the schema name)

https://learn.microsoft.com/en-us/power-apps/developer/data-platform/reference/entities/usersettings

It’s the TimeZoneCode that you want to update – 85 for London, and other codes are here https://learn.microsoft.com/en-us/power-apps/developer/data-platform/reference/entities/usersettings#BKMK_TimeZoneCode