Use the following steps:


1.) Open MS Teams.


2.) In the "Search" field on the top of the page, type the user's full email address. (Example: Hailey.Tilgner@das.oregon.gov)


3.) Click on "Search [User] Externally". (Important note: Disregard Guest.)



4.) Select "[User] (External)".



5.) A new chat window will open and you will be able to message the user.