When publishing my game from Stage to Live, the Live page had an informational popup which could not be dismissed. This prevented the rest of the page from working, as the popup was modal and blocked any further progress.
I found a workaround, so I figured I’d post it here: just use the Tab key to navigate the focus between controls on the page. You’ll eventually land on the Publish button, then hit enter.
Hopefully the website team can fix this as I’ve filed a ticket, but in the meantime, this will allow you to still publish.