This is a follow up to https://stackideas.com/forums/self-explanatory-question-is-why
The real issue it turns out is that while the button does show up, the Joocial form form does not work and I get the error message in the attached image whenever the composer is loaded. Basically, a duplicate form with the result that both appear to be inactive.
So, while I can click the various options the form gives such as "Post Immediately" and such, there is no effect.
I assume some sort of JS is used to "move" the Social Publish Form to the composer modal and it would appear that the one left behind needs to be disabled so that there is only one left so to speak.
Just a hunch.