Conversations involving multiple participants, allowing collaboration and information sharing in Teams
Best workaround, check “Disable GPU hardware acceleration (requires restarting Teams)” in Teams Settings/General and then restart your Teams.
And what makes you say it's the "best workaround"? You've tried all the workarounds independently and in combination, waited weeks to see if and when the problem would return with each combination, and conclusively determined that just disabling hardware acceleration works around the problem the best?
Or you just switched off hardware acceleration, restarted Teams, and your arrow keys were working again so you assumed it was the hardware acceleration, and not just the fact that you restarted Teams?