Hi Melissa. Thank you so much for taking time to send a response to the question originally asked. The problem that we were having was getting the 3.5mm TRRS male plug going into the Mac to be recognized as a microphone and not as a headphone. No combination of cables, adapters, or anything that we tried was successful in getting the Shure BLX14/CVL to work with the MacBook Pro 16 (2019).
I ended up speaking with the tech-support folks at Shure and they suggested an additional digital interface device called Mvi.
I suspect that might have worked, except for the fact that we were not looking to add additional pieces of equipment to the mix in order to use a wireless lavalier mic with the MacBook Pro.
We have solved this dilemma by switching to a different brand of lavalier mic altogether that connected to the MacBook Pro without any issues.