Before you start, remember that a device restart can cure a range of issues, regardless of the cause. Try restarting your device or simply resetting your AirPods before moving forward.
Are your AirPods refusing to connect to your iPhone or Mac? If your AirPods won’t connect properly, there are a few things you can try:
Update your Mac, iOS device, or AirPods firmware. Make sure your iPhone has the newest iOS, or your computer has the latest macOS. The device needs iOS 12.2 or later, or macOS 10.14.4 or later. Also, check that your AirPods have the latest firmware update.