Choreio does not use MDM or VPN profiles, which makes Choreio very secure. But Choreio cannot be used along with other parental control apps (except Apple’s Screen Time). This is an iOS-level limitation. If you have have previously installed another parental control app (like Ourpact, Qustodio, Bark, Family Link, etc), you likely have an MDM profile installed. Please remove any MDM profile you have enabled in Settings > General > VPN & Device Management.