Noise coming in AirPods when on Voice Call

They r doing a repair or replacement program for issues w this being unresolved along w possible issues w noise canceling not working. Hope this can help if the troubleshooting didn’t

https://support.apple.com/airpods-pro-service-program-sound-issues

Although this applies to AirPod Pro, maybe it will help:

If your AirPods Pro make crackling or static sounds - Apple Support