Spam and Phishing messages in Microsoft Teams are an unfortunate reality. Justlike unwanted email, once your contact details are proven more tend to arriveeveryday. Thankfully this feature will help. At the time of writing (January 2023) confirmation for new message from user of Teams from a personal account(i.e. not managed by an organisation) have had this acceptance feature, but not this is rolling out for messages from users of work & school accounts too.