Aukey EP T-21 won't enter pairing mode

After working briefly on all three of my devices: iMAC, MacBook Pro, and IPhone, my Aukey EP T-21 earbuds stopped being recognized by any of my devices and won’t go into pairing mode. I have tried everything, including debugging my Bluetooth settings on my laptop and restarting, as well as holding the touch-sensitive area on both buds for 8 seconds and then 15 seconds, returning them to the fully charged cradle, and taking them out to try to pair again. When I first opened the package, left and right had trouble pairing with one another, though I was eventually able to reset to get them to pair. I am starting to think I have a lemon set of earbuds. My husband received the same for Christmas and his have worked fine from the start.