Hey There,
If you go to the M365 Admin Center, then:
- Navigate to Settings
- then Org Settings
- Then Organization Profile
- then finally Data location
you should find what you're looking for there.
The following excerpt is from Microsoft's documentation on Multi-Geo, which confirms what you're thinking:
By default, Microsoft 365 resources for your users are located in the same geo as your Azure AD tenant. For example, if your tenant is located in North America, then the users' Exchange mailboxes are also located in North America. For a multinational organization, this might not be optimal. By setting the attribute preferredDataLocation, you can define a user's geo. You can have the user's Microsoft 365 resources, such as the mailbox and OneDrive, in the same geo as the user, and still have one tenant for your entire organization.
It's worth going over Microsoft's documentation on the subject, especially wi9th your Multi-Geo considerations. Links below:
M365 Customer Data stored at rest
Configuring Preferred Data Locations
Hope that's helped!