linar65 wrote:
Yes, I did as the article says, I deleted the child's account, and removed Family Sharing, but now I can't log out of the account on the iPad, in fact, now it can only be used for multimedia, without the ability to install new applications.
You didn't sign out of the account on the iPad first. There is no age restriction to be able to sign out of a device.
Unfortunately since you did not do that she cannot sign out. You will either have to get Apple to reinstate the account—if it is not too late—and then sign out properly, or you will have to ask Apple to reset the device. Apple can completely reset a device if a person can provide sufficient evidence of valid ownership. Read the requirements and steps for an Activation Lock support request at: https://al-support.apple.com/#/additional-support Apple says you need to have "proof of purchase documentation” and “proof of ownership documentation”, but does not detail what currently constitutes proof other than it “must include the product serial number, IMEI or MEID.” User reports on this community indicate that typically Apple will ONLY accept an original receipt issued by Apple or an Apple Authorized Reseller. Presumably this is the only kind Apple can authenticate against fraud since Apple is not involved in third party sales. Apple recommends that you "Keep your receipt after you buy an Apple device" --> Keep your receipt after you buy an Apple device - Apple Support
Note that the device cannot have Lost Mode set on it. If your device has been taken over by you having entered a scammer’s Account then the scammer may have set that too and the device is lost to you.
If Apple resets the device this will give you access to the device but won't restore access to the account used to lock it. There is nothing that can be done to expedite an Activation Lock request.
By the way, please stop posting using the code format box. It makes your entire post appear on a single long line and very hard to read.