How to reset password
Can apple id and password use on my iPad
iPad Pro 9.7-inch WiFi, Cellular
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You can use the same Apple ID on your iPhone and your iPad.
If you forgot the Apple ID password, enter the Apple (iCloud) ID, and click Forgot Password. See if you can get a Rescue or Notification email option if necessary. Link to contact Apple Support at the end of the 2nd article.