In this video, you'll learn how to use the Power BI Service built-in "Comments" feature.
This allows you to quickly and easily add comments to Power BI report pages and even individual visuals. You can also post replies to each comment and effectively start a conversation about the dashboard and the data displayed.
You can add @ mentions too. These results and an email being sent to the person mentioned with the comment text included in the email. The email will contain a link to the underlying report in the Power BI service.
Finally, each set of comments contains a bookmark so you can quickly switch to the filters that were applied when the comment was made. This will allow you to return to the context of each comment when you are reading the information in the comment.