Hi all,
I second what ChrisAyers mentioned, and the reason I came here looking for an answer.
We have multiple plan task members, and more often than not, when a member gets an email about a plan task comment or question, they follow the instructions, and simply hit reply in Outlook, which means their reply is NOT captured in the planner task. Awesome recipe for people being misdirected and/or information being lost.
Have to ask why bother having those instructions in the email? More to the point, if Microsoft programmers can't get that bit working, would it not be more prudent to simply have the email state "someone has made a comment/added something to a task you are involved in, click here to open the planner task to view the information"? That way it will keep the "paper trail" of information in the one location, which after all is what Microsoft/Office 365, Teams, is all about isn't it?