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Workflow Error on mail event after deployment on new update with error System.Object' cannot be converted to type 'System.String
Workflow goes into error state on mail event.
This is a known issue and will be fixed in an upcoming update for Appit.
Workaround: Use the Name property instead, this will return the K2 FQN, meaning it will look like this AAD:User@someplace.com. Then use the inline functions to replace the AAD: with an empty string to strip it down to an email address.