Hello Team,
We could execute below commands upon Microsoft confirmation.
Set-ActiveSyncOrganizationSettings -DefaultAccessLevel Block
New-ActiveSyncDeviceAccessRule -Characteristic DeviceType -QueryString "Android" -AccessLevel Block
New-ActiveSyncDeviceAccessRule -Characteristic DeviceType -QueryString "iPad" -AccessLevel Block
New-ActiveSyncDeviceAccessRule -Characteristic DeviceType -QueryString "iPhone" -AccessLevel Block
New-ActiveSyncDeviceAccessRule -Characteristic DeviceType -QueryString "iPod" -AccessLevel Block