I have android. I set up my kids IPhone`s and now they cannot buy anything because i cannot approve the purchase thorugh Ask To Buy. I am frustrated becasue no where in the setup process does Apple tell you that you must be an IPhone user for this

I set up my daughters IPhone, I switched from IPhone to Android a while back because it interfaced with my work life better. When setting up my daughters new phone it asked me if I wanted the Ask To Buy feature turned on, and I selected yes, I have an Apple ID from back in the day and used that ID to set it up. Unfortunately i cannot control anything on her phone through ICloud or Itunes now, and cannot approve any purchase requests. This is pretty frustrating as I don`t own any Apple devices personally. Is there anything I can do to help them actually use their phones? I am at a loss and my kids now have very expensive phones that can only browse safari, and not download anything from ITunes given the current situation.