I don't know what apple ID Set up the ipad
Ipad was locked by a toddler cant activate with Apple ID
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You can recover your AppleID here:
If needed, once access to your account has been recovered, you can update and make any changes here:
If you’re locked out of your iPad, the device recovery process is described here:
https://support.apple.com/en-gb/HT204306
I hope you find this to be helpful in solving your problem.