Use Desktop Outlook App: TryMarshalData timed out

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I’m trying to read emails from Outlook account using “Use Desktop Outlook App”. When debugging in regular mode it’s working pretty normal. When debugging in Picture in Picture - New session mode it returns exception: “Use Desktop Outlook App: TryMarshalData timed out.”.

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I encountered the same situation using “Send Outlook Mail Message” and other outlook activities, and solved it in the following way :

  1. extract the outlook activity as workflow
  2. Modify the properties of “Invoke Workflow File” activity
    2-1. check “Isolated” in “Input”
    2-2. Change “Target Session” in “Misc” to “Main”

Hope this can help