Hi All,
Frustratingly, ran into a similar problem. I took off the Survey 123 I used to build the Workforce App, and now I can't select it. It is a public survey for now, I'll see if taking it off public is the answer in the meantime, please let me know if there are any other tricks <embedding a link anywhere, or any new fancy options.
Deploying an app to keep people safe out in the W. Desert of Egypt right now, and wasn't expecting this issue...