Only left AirPods Pro is working

There is no such thing as Earpods pro. Earpods are wired headphones made by Apple.

Airpods Pro are Bluetooth headphones made by Apple.

If you meant Airpods Pro, see this:

If your AirPods won't connect - Apple Support

ssempagama Said:

"Only left AirPods Pro is working: My EarPods pro are new and only the one on the left is working. The one on the left cannot even be shown in the settings."

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Go Here: If your Left or Right AirPod isn't Working - Apple Support