At the trigger "When a new channel message is added" of Microsoft Teams the sender of the message (his email address) is currently not returned (when the message is a external mail) and therefore cannot be used in later actions.
The trigger only returns the name of the user (from.user.displayName) if it is a internal/known Teams user.
We are using the channel as a kind of ticket system where external users can send emails directly to a teams channel and the flow automatically creates a task in Planner, etc. Unfortunately, the information of the external sender of the message (his email address) is not available here.
Please add this useful information to the existing trigger!