Only one earbud pairing st a time

I received my earbuds for Christmas and I have only been able to pair and revive from one at a time. I’ve tried most of the suggestions from others who’ve had this problem here. What’s next? How do I get this resolved?

I meant to say that only one earbud is receiving sound at a time. Both work, but can’t get them transmitting sound simultaneously. E What’s the best way to address this?