Running this plugin for the first time.
got a page set up with the following shortcodes:
[zombaio_join align="left" width="300" join_url="https://secure.zombaio.com/?287656198.1804506.ZOM" buttonalign="center"]Pricing[/zombaio_join]
The Seal loads fine however no form is displayed. Inspecting the page shows it loads just a <p> element in its place.
In Zombaio the site is setup, approved and in live mode, the join url taken from my pricing structure is correct and works when entered into a new tab.
EDIT: Discovered that the plugin hides the join form for logged in users. Silly mistake on my part to not check while logged out.