You are likely receiving this message from Amazon as a result of your Communication Center's "Approved Sender" email address not being your Seller Central login address or listed as an approved sender in Seller Central. This will stop your messages from sending through Amazon, as well as triggering this notification.
In order to fix this issue, please read this article!
In the case that your from email address is indeed listed as an approved sender, please reach out to Seller Support for information on how to proceed.
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