If you are getting a "not supported" message you must contact Apple. This is beyond account recovery.
To reach Apple Support for an account issue:
1. Click here --> https://getsupport.apple.com/?caller=cups&PGF=PGF63005
2. Select: Disabled Apple ID
3. Select: ”The Apple ID is not active" alert
4. Select: “Continue”
5. Select a chat or telephone call option.
or:
Contact Apple for support and service by telephone --> Contact Apple for support and service - Apple Support
IF you do not care about that particular account, Apple can completely reset a device if a person can provide sufficient evidence of valid ownership. Check the requirements and steps at: Activation Lock support request - https://al-support.apple.com/#/additional-support Apple says, "Proof of ownership documentation is required," but does not detail what currently constitutes proof other than it “must include the product serial number, IMEI or MEID.” Apple may typically require the original receipt* issued by Apple or an Apple Authorized Reseller. 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.
*Apple recommends you "Keep your receipt after you buy an Apple device" --> Keep your receipt after you buy an Apple device - Apple Support