The issue is that users in our tenant are able search for and send Teams chat messages to mailboxes and users that don't have Teams. This includes shared mailboxes and users with Exchange only license. (O1) Neither of those have the ability to log into Teams.
User A searches for User B in Teams, finds User B, and sends them a message which looks like this:
Aside from appearing to be offline, there is no indicator that this user has no ability to respond using Teams. User B isn't left completely in the dark however. Teams will eventually send an email, but it isn't like the ones all of us who have Teams are used to seeing when we leave an unread message for a time.
this is extremely unhelpful for two reasons: First, it doesn't include any of what User A's original message was, and second, try as User B may they cannot log in to Teams to see the activity. At least it lets them who is trying to contact them so they can respond with an email and try to figure out what the original communication was.
Has anyone else noticed this behavior occurring in their Tenant? My opinion, Teams should not let this behavior occur. At minimum there should be a message saying something like, delivered, user is not valid,
Is there anyway to make it so Teams won't even show Exchange only and shared mailbox accounts as an option to chat with?
Thank you for your time, help and advice.