Planner comment notifications
Planner email notifications for comments do not go to those who are added to the task after its creation. If someone is added to a task after it was created, they need to post two pointless comments on the task before they start getting email notifications when others comment on it, Microsoft reps have confirmed for me that this is by design.
Users that are assigned a task should ALWAYS get email notifications for the comments on that task, whether or not they have commented twice, or are assigned after the tasks creation. To improve this feature further, include an option for each task to turn email notifications on or off for it (on by default if they are assignees of the task, whether assigned during creation or after the fact).
Please also implement that users who CREATED the task ALWAYS get email notifications for the comments on that task. The creator of the task always has to post a dummy comment to be notified when the assignee is asking for clarification of the task in the comment section. This results in having to ask clarification questions outside of planner, which doesn't make much sense.
Fix witht the @username functionality like jira.
Fully agree with this. This has actually been a deal breaker for a number of our users that has resulted in them using a different product. They really like Planner, but the fact they don't get notified of comments if assigned to a task has stopped them using Planner.