It worked! Well kinda.
I received several calls as tests and the feature worked every time. The only fly in the ointment was the caller reported that every time I screened the call and then accepted it, they would have an echo of their voice on their side. My side of the conversation was always good.
I had them repeat the calls and I would pick up without screening. No issues.
I called them… no issues.
I had them call me from a different phone again testing the screening and again they would hear an echo of themselves.
(This is at home in airplane mode with WiFi on)