I'd love to help but I'm not understanding that sentence at all.
There's 4 pieces of code to be pulled from Github and added to two hubs... one Hubitat, one ST.
App: HubConnect Server for Hubitat
App: HubConnect Server Instance
Driver: HubConnect Remote Hub
Those 3 get installed on Hubitat and are from/in the Hubitat folder of Github.
App: HubConnect Remote Client
Gets installed on SmartThings and is from/in the SmartThings folder of Github.
Having added the code, they have to be ready to run. From the words written:
...I'm ready to believe all of the above is correct, but I would ask for verification that it's the SmartThings version of Remote-Client that got deployed on SmartThings?
On Hubitat, you open the HubConnect App and get a Key, which can only happen if you have the App and it's child app working.
But here's where my mind can't follow.. "No app showing" Where?? ST?
Did you Publish the App?