Integration between e-mail and card in planner (Teams integration)
E-mail from a comment on a card in Planner (Teams integration) comes from the users e-mail account. When "reply", the card is not updated - only fires off an e-mail to the other user directly. You'll have to "reply all" to get card updated. The senders e-mail should be from the Team with reference to the card for all communication on a card to be updated.