@cinnamontoast I am referring to ScreenTime API. Screen Time in Settings working fine with MDM (I can use both when they're co-exists). few more information, If MDM installed prior to calling 'AuthorizationCenter.shared.requestAuthorization(for: .child)', API is returning FamilyControls.FamilyControlsError code '0'. If 'AuthorizationCenter.shared.requestAuthorization(for: .child)' gets succeeded prior to install MDM, MDM profile installation failing with 'MDM is not allowed' error.

@eskimo I just tried to install MDM profile after enabling screen time permission for my application, but MDM profile installation gets failed. Is it expected behaviour?

Yes it asked for parent/guardian credential for turning off.

@kgaidis Try Erase all content and settings in your device and try it again. For me once it happened and I tried "Erase all content and Settings" option, my wild guess is, it could be some authorization happened in past which is not been revoked correctly.

You can save it as object in Codable format.