Air Pod Pros

Are you using iOS 13.2 or later? That is required.

If your AirPods won't connect - Apple Support

SZacarias18 Said:

"Air Pod Pros: My air pods are connecting to my Bluetooth but I have not been able to successfully connect them to my iPhone 8 Plus."

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Verifying AirPods' Authenticity:

Perhaps these are not authentic? Be such, they may not connect. A Few Links that May Help:

1. Find the Serial Number of your AirPods
2. Identify your AirPods
3. Check Your Service and Support Coverage