I removed iPad from Apple ID and cannot sign in on iPad with the new Apple id
How to sign in on iPad with the new Apple ID, if the old Apple ID is frozen and doesn't sign out?
iPad Pro 9.7-inch WiFi, Cellular
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and force restart
If your iPad won't turn on or is frozen - Apple Support
Discover how to 'Check your Apple ID device list to see where you‘re signed in'
click here --> https://support.apple.com/HT205064
- Learn which devices appear in your Apple ID device list, how to see your device's details, and how to remove a device, if necessary.
- Special section at the end on how to "Permanently remove a device from your account page"