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Is MessageId different for an Alias account?

I have an email box "" and an alias I am using ""


When I use the Alias in power automate,  the flow executes and I get a messageId. Then I use that messageId in EWS to retrieve the email by connecting to the exchangeService with "" and attempting to retrieve that Item by the Id, but get an Id is malformed error. If I do the same thing with "" the messageId appears to be different, and EWS is able to retrieve that Item successfully.


Is there a difference in the MessageId for emails vs. aliases that I should be aware of?


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