AirPods 4 not connecting or discoverable

"AirPods 4 not connecting or discoverable: My daughter's brand new air pods 4 no longer connects to her iPhone. They are no longer discoverable. We have reset the headset, forgot the device and they are still not connecting."

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Troubleshooting AirPods Connectivity:

A Few Thoughts to Try:

A. Visit Apple Support links:

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

• If your AirPods Won't Connect – 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

D. If connecting to a Mac...

A. Reset the Bluetooth Module:

Resetting the Bluetooth Module in that method is simply just no longer an option in today's macOS versions, being it was canned. For reference, I wrote this user tip back in April 2021, prior to the release of macOS Monterey: Use "Reset the Bluetooth module" to Fix Constant Bluetooth Disconnections - User Tip. So, try the following...

• Restart the Mac
• Reset the SMC and your NVRAM:
• Use this Terminal Command:

sudo pkill bluetoothd