Error: Did not finish. One or more recipients are invalid

When creating Exchange Calendar items in the Exchange integration area of Administration, the error: Did not finish. One or more recipients are invalid is returned.
Download and install the latest patch, which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch. 

Environment

 2.7.1654, patch 84
 2.91.1535, patch 65 ; 2.93.2034, patch 24 ; 2.94.1524, patch 5 ; 2.9.1001, patch 106 ; 2.7.1654, patch 105

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