Test it with your phone to make sure it is not a hardware issue, I have a pair of earbuds that sometimes only play in one ear, it was a hardware issue, I had dropped the earbuds on the floor and I think I damaged them. I would also try the usual unpairing the device and pairing it again, you never know, sometimes that works. And for the mic check your Sound settings where it says “input device” to see if it is being detected.