How to deal with this message from Amazon "prove your publishing rights"?

Hi,

His book is already selling & active on Amazon for like 2 weeks. It triggered their review after minor book cover update. He changed nothing else

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We've reviewed the information you provided. Based on our review, we're unable to confirm that you hold the necessary publishing rights.

The information you provided is insufficient because of the following concerns:

• Documentation or information explaining the edition previously published on Amazon has not been provided.

• Documentation has not been provided to confirm you are the original author of the content.

• Documentation has not been provided to confirm that the author granted you rights to publish the content.

• Documentation has not been provided to confirm that rights were reverted to the author from the previous publisher.

• We are unable to accept a personal statement by you that you have the publishing rights.