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I recently went on find my iPhone and erased my iPad but now that I did that I can’t enable my restrictions anymore. Can someone please help me?

As long as you can reset the iPad and set it up as a new iPad either through iTunes or from the iPad itself, restrictions should be able to work. If the iPad has preloaded information, try restoring from a backup stored on iCloud or iTunes and enable restrictions. If I could have more information, I may be able to help further.