My iPad is not charging
I can,t charge my device
Because when I plug in charging cable in charging port a message appears
This accessory may not be supported
iPad, iOS 10
Question marked as
Are you using a genuine Apple charger and cable - or something else?
This message generally appears if a non-Apple accessory, or unsupported peripheral device, is connected to the iPad/iPhone.
If you are using a genuine charger and cable, try a forced-restart of your device - as this often resolves unexpected issues.
https://support.apple.com/en-gb/guide/ipad/ipad63d30b5a/ipados
If still unsuccessful, substitute your charger and cable for known good kit - one item at a time and then together - in an attempt to eliminate individual components.
I hope you find this to be helpful is resolving your issue.