My left AirPods won't connect to my iPhone

Mdmilad Said:

"Left said other case right said is original case before used left tha case"

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Troubleshooting AirPods Mismatch:

A. Start here: If you see an alert that says "AirPods Mismatch" - Apple Support

B. Verifying Genuine AirPods:

1. Get the Serial Number: Find the Serial Number of your AirPods - Apple Support
2. Enter the Serial Number here: https://checkcoverage.apple.com/.
3. View the Results: If all shows up as an AirPod, then you are fine. If not, then these are fake, and that is likely why you are getting the issue of connectivity.

C. A Glitch in Apple's Device Database?

I would contact Apple Support, asking them if there is a glitch in their user database. You should not be getting this message, if they have already been repaired. If these are used, then that may be why this is occurring.

 How to reset your AirPods and AirPods Pro - Apple Support

After you reset the AirPods, try Apple Support's method:

How to: Connect your AirPods and AirPods Pro to your iPhone - Apple Support

or

If an AirPod or your charging case is a replacement:

How to: Set up your replacement AirPods or charging case - Apple Support

Resource:

AirPods Support Website:

Find all the topics, resources, and contact options you need for your AirPods....

AirPods Support - Official Apple Support