[Enigmail] Confusing Warning

Mark <[email protected]> Wed, 1 Jul 2020 21:21:05 -0700
Newsgroups gmane.comp.mozilla.enigmail.general
Message-ID <[email protected]>
I get security notification emails from MS that are PGP signed.  I'm not
sure what part it not signed as when I click on details it on says the
following information. Also confusing is that key is in my keyring and I
certified it.

Am I missing (or misunderstanding) something here? 

Part of the message signed
Unverified signature
Public key 6CC73355668F7B75 used to verify signature

BAD signature from Microsoft Security Notifications
<[email protected]>

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