List owners of devices with "Get-AzureADDevice" command
When using "Get-AzureADDevice" commands there is currently no way to retrieve information about the device owner. Adding this would add more flexibility when generating device reports from Azure AD through PowerShell.
Get-MsolDevice -All -ReturnRegisteredOwners
https://docs.microsoft.com/en-us/office365/enterprise/powershell/connect-to-office-365-powershell specifies that you still need to use both AzureAD and MSOnline modules.
Rune Mariboe commented
I use Get-AzureADDeviceRegisteredOwner and/or Get-AzureADUserRegisteredDevice :)