AirPods Pro 2 can't place or receive phone calls

My new AirPods Pro 2 won't place or answer phone calls on my Iphone XS.

When placing a call with Airpods Pro 2 connected, there is an audio delay. After the recipient answers, usually the headphones start working after about five seconds.

I am unable to receive calls with Airpods Pro 2. I will answer the call, switch to speaker, then after a few seconds switch back to Airpods and then *sometimes* that works and I can hear audio via the airpods.

Airpods Pro 2 works great for music and video. My IOS is fully updated. I even connected the Airpods Pro 2 to another iphone (Iphone 14 Plus) and the headphones work perfectly with the 14 Plus.

Here's what I've tried:

--Erased All Network Settings on Iphone XS

--Hard reset of Iphone XS

--Re-paired (over and over) the Airpods Pro 2

--Deleted (Forgot all Devices) all Bluetooth devices on Iphone XS

--Unpaired Iphone Watch from Iphone XS

--In Airpods settings, changed microphone from "Automatically Switch Airpods" to "Always Left Airpod"

--My battery is fully charged on Iphone XS

--My Airpods are not connected to any other Apple devices.

I've researched this topic online and tried numerous suggestions with no success.

Why would the Airpods Pro 2 work perfectly on the Iphone 14 Plus but not work with my Iphone XS. I'm running same IOS on both - 16.2.