change locale settings for Office 365 group files
Administrators should be able to configure locale settings (including language, date and time settings, time zone, etc) for all new and existing Office365 groups and their files.
Steven Normyle commented
Agreed! Behaviours should be available in the same way that root SP sites can be configured. The options are there, they just don't work! I've spent just over a week working with a support guy from Microsoft - and despite his best efforts, the issue appears to be a behaviour design floor.
This also needs to be an option under Teams Admin settings on o365. Until I found a json script a few hours ago this wasn't even possible for pre-provisioned Groups which use predefined templates.