App for Outlook Tracking Issue

Hi All,

I am using the App for Outlook and have an issue with Tracking.

When we receive mails we use the "Set Regarding" and everything is fine. The mail will be tracked (mainly in Opportunities).

When I reply to a - already tracked - mail, the mail seems to be tracked but after a few seconds a message appears "Email recipients have been added and removed" (please see below) and the mail is NOT being tracked.

When I go to my "Sent Items" folder in Outlook and track it manually afterwards it is working...

This is very frustrating as we do not want to track all outgoing mails manually. Is there a solution for it?

Thanks!