Trying to repurpose old iPad after wiping.
When going through the setup process it says the email address used on other devices "cannot be used to unlock this ipad". I have no idea what other email address it might be wanting!
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If you are repurposing an iPad - you should follow the guidance outlined here:
What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support
Following this process will properly erase the iPad, removing all personal and sensitive information - and remove the Activation Lock that will otherwise cause difficulties.