Ah, got it. Unfortunately, I think that method no longer works either, which is part of what brought me to this thread. Well, you can still login using the pop up window, but it doesn't carry your browser session over any longer and seems to require a fresh introduction of user credentials each time...

I'm curious if you figured out a solution to this issue. I was able to make my OAuth app setup work, but only using the Search a Record module where MTM was an option in connection setup. The problem now is that the connection only is selectable on the Search a Record modules as well, although I can...