Use Desktop Outlook App: TryMarshalData timed out

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