Conversations involving multiple participants, allowing collaboration and information sharing in Teams
I have the same issue, restart machine seems to be OK for a random period then the left and right arrow keys stop working, again. Strangely the arrow keys still work in any other application including Microsoft apps so its not system related just Teams App related. This started after the update to Teams allowing replies to messages in chat and use of up arrow to select edit of the last message in the chat window. Apart from that there have been no other significant changes to my machine.