Default Teams Notifications for all Users/Tenant

[O365User_45787]

Is there a policy that can be set or PowerShell command to set default Teams notifications for your tenant.  Basically, we want to set our default notifications differently than MS has, specifically for the new Calendar notifications in that are now showing in the Activity feed, but it would be nice to customize the default notifications settings for all users.  

[#2]

Hello,

Regarding Real-Time calendar notifications, they can't be customized globally but rather every user needs to set their preferences and it is the same for other types of notifications.