Well this story has taken an extra turn (for the better). The same LI App discussed here for JFBC I am also using for EasyBlog (@Stackideas - fwiw, they too are having the exact same issues as the rest of us getting their app approved).
However, they gave me some updated files to replace in several LI directories for their Component and, for whatever reason, our LI App was then able to pull these advanced permissions only available under the Marketing Developer Platform:
I could also map/select the desired Company Page:
I decided to revoke the token, logout and retry to see if it would pull manage Pages/Posts permissions for JFBC - and? It does now (2nd step of Permissions Request after the initial default request for email, profile etc.):
I'm still not getting a connection to JFBC Channels though:
* full disclosure: I also think I'm not setting up the Channels correctly with the plugins/objects or just not understanding how this area works, but to keep the issues clear I will open a separate ticket on that.
** I like the option to add the callback url and have done so; will PM you the necessary info. If you also need access to our site Admin Backend/Panel I have a temp user account that i can bump up privileges for, and can still setup for SFTP if necessary.
Thx Arlex for your help here and if you can use anything else in the process for the benefit of JFBC (access, information, etc.) we are happy to oblige access or info that helps Sourcecoast.