AirPod replacement

Hi Salt788,

Welcome to Apple Support Communities. Since this was originally a replacement and it sounds like the AirPods may not be communicating with each other any longer, it may be best to try the steps in Set up your replacement AirPods or charging case.

"Set up your AirPods or charging case

1. On your iPhone, iPad, or iPod touch, go to Settings > Bluetooth and tap the Information button  next to your AirPods.
2. Tap Forget This Device.
3. Tap Forget Device, and tap again to confirm.
4. Put both AirPods in your charging case.
5. Open the lid and check the status light. It should flash amber.
6. Press and hold the setup button on the back of the case for a few seconds. The status light should flash white.*
7. Go to the Home Screen on your iPhone, iPad, or iPod touch.
8. Open the case—with your AirPods inside—and hold it next to your iPhone, iPad, or iPod touch. A setup animation appears on your screen.
9. Tap Connect, then tap Done."

Take care.

Salt788,

If you have tried all those steps, the next best thing to do is reach out to Apple directly as they'd be able to look into the issue further with you: Get Support

Cheers.