I bought a replacement AirPod and I’m having trouble connecting it

Set up your replacement AirPods or charging case - Apple Support

Then contact AppleCare and report this to them so they can send you another one.

pegah179 Said:

"Airpods: I bought a replacement airpod and I’m having trouble connecting it"

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Troubleshooting AirPods' Syncing:

I. Troubleshooting iPhone Bluetooth:

Start Here: If you can't Connect a Bluetooth Accessory to your iPhone, iPad, or iPod touch - Apple Support

II. Troubleshooting AirPods Connectivity:

Start Here: Connect your AirPods and AirPods Pro to your iPhone - Apple Support

A Few Links to Try:

A. Visit Apple Support links:

•  If your AirPods Won't Connect – Apple Support

• If your Left or Right AirPod isn't Working - Apple Support

• Connect and Use your AirPods and AirPods Pro – Apple Support

B. Verify the Balance:

1. Go to: Settings
2. Tap: General
3. Tap: Accessibility
4. Scroll Down: to Hearing
5. Adjust: the audio volume balance

C. Also, Clear Out Earwax:

How to Clean your AirPods and EarPods - Apple Support