Forgotten Apple ID
How can I sign out from my old iPad
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Sign out of iCloud on your iPhone, iPad, iPod touch, Apple TV, or Mac - Apple Support
iCloud: Remove your device from Find My iPhone
https://support.apple.com/guide/icloud/remove-a-device-mmfc0eeddd/icloud
• "If you forgot to turn off Find My [device] before you sold or gave away your iPhone, iPad, iPod touch, Mac, or Apple Watch, you can turn off Activation Lock using Find My iPhone on iCloud.com . "
What to do before selling or giving away your iPhone, iPad, or iPod touch"Use these steps to remove your personal information from a device, even if you don't have it anymore." Click here --> https://support.apple.com/HT201351