iCloud and iMessage Are not the same
Messages in iCloud not available as iCloud and iMessage account do not match?? What is going on ?
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Exactly what it says. The accounts you are using for each service are not the same.
Go to Settings ➡️ Apple ID, and Settings ➡️ Messages ➡️ Send & Receive ➡️ Apple ID and make sure it’s the same one in both places.