This was a fun one. Microsoft blocked a user from sending emails a few weeks after the original incident. When I looked to see where the user would normally show as blocked in the online interface, it was not identified as blocked. So, the only thing I could think of was to check it in PowersHell. (Why do I have to use PowersHell for everything...)
1. Install PowersHell 7 (it is much easier to connect to exchange online)
2. connect-exchangeonline and login when prompted
3. get-blockedsenderaddress to see if the account in question was blocked
4. remove-blockedsenderaddress -senderaddress flast@domain.com
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