Connect Zwift Mobile Link on one iPhone to Zwift App running on another iPhone

As the title states, I have two iPhones.  My “good” one runs the app which works great and then I have another, older model that I use as a wifi device with ZML installed on it.  

When I tried it last night, ZML just said I was Zwifting but I couldn’t see the map or any nearby zwifters.

I had ZML installed on the good iPhone and I think it worked the way I wanted but I think it also was causing a conflict with the heart rate monitor on the Apple Watch so I removed it and now the HRM works.

Any thoughts?