How are you retrieving the initial MailMessage objects? Are you able to switch your processes to either use ;
- The Office 365 “Get Mail” activity (which will retrieve an Office365Message object), then forward using the 365 activity too
- Use the Outlook “Get Outlook Mail Messages” to retrieve the email in MailMessage format, then use “Forward Email” to forward this MailMessage?
If you consistently use either the Office 365 activities, or Outlook activities, this should mean you can use the same objects.
Feel free to share the XAML file or a screenshot for better understanding if this doesn’t address your issue ![]()