Have you ever wanted to contact a person via Teams to whom a task has been assigned? If your answer is yes, you should take a look at the video and the blog post.
I finally found a solution for starting a chat by clicking on an assigned user.
In case Microsoft fixes the issue that the Teams Windows desktop application ignores the message, you can start a chat with a configurable message and the URL to the current workflow instance.
You can read up on it here: