To UPDATE:
Happy to confirm new app installed fine on spare phone and then allowed option to download the test release f/w that enabled the new options.
Running in Laird payload format the ‘confirmed’ option is on and greyed out - looks like you have to use ack with Laird version (at least for now). (see earlier packets in image below). Then switched payload format using the app to enable Cayenne vs Laird and confirmed no longer greyed out and can chose either confirmed or unconfirmed - later packets in image show Cayenne format and unconfirmed 
Better yet the payloads are coming through without having to set up a (e.g. Node-RED) server to send an initial timestamp before the payloads start rolling in… 
Now a happy geek and next steps set up Cayenne integration per draft App Note
Will update on progress in coming days…