I want to ensure I understand your issue, please forgive my question.
You are trying to access ThingWorx Community via Jive's mobile app correct? Jive's app will help you access their community, which is excellent - I am there every day Toby Metcalf's Profile |Jive Community .
However, their app will not provide access to ThingWorx Community.
I access both PTC Community and ThingWorx Community via phone or tablet by bookmarking in a browser. When I access either via mobile, it is great for consuming, but not so much for participating in or creating discussions.
I hope I understood your issue; please let me know if I did not answer your question.
But Jive App should be able to access to ThingWorx Community also, as that's the purpose of this App, it's not limited to their own community, you can see it as the app what first asks it's the URL of the community where you want to access.
If I understand well, currently TW it's blocking the access TW community from the Jive App, as I've checked and current TW Jive Community version it's 7.X which it's supported by the Jive Official App. Can you check this with TW Community administrators?
I know I can access the community through mobile browser, but this it's far from being good compared to a native App which it's already available.