If you are here looking for a solution to fix the muffled sound from the right earbud of your Jabra Elite 65t, you are in the right place. I have gone through the same problem and was searching for a solution and came across this post. As suggested in the post I have taken a tooth pick and gently cleaned the tiny hole which you see between the 2 charging connectors and voilà it started working again.

NB: Please do this at your own risk
Jabra elite 65t, right earbud sounds quieter than than the left one
Worked.. thanks.
Never saw that little hole.
This works, couldn’t believe it as I’d searched for ages, Thanks