So I have added NST manager to my smartapps.
I have created a ID and Secret in nest developer
Default OAuth Redirect URI https://api.smartthings.com/oauth/callback
Copied ID and Secret from nest to smartapps settings
I go to myapps on mobile device, select Nest manager
Click on login to Nest, enter user and password to get a ‘oops! Encountered an error’
~```correction~~~ I meant Oauth…not publish…not that this is the issue anyway apparently~~~
I am very new to this app so please take my post with several grains of salt. I had the exact same problem a few days ago last Sunday when I installed the app. In my case I had “published” 2 things instead of just the one outlined in the instructions. I don’t remember the names of the items but when reading the install doc, it’s pretty clear. I just screwed up. I didn’t bother to look for a correction method, I just started over and it only took a few minutes. One thing I did check is that I could log into the Nest Developer site on a browser to verify my username/password/account existence. It’s working very well now.