Migration issues - .com thinks I haven't activated on Github Apps

Migration tab under my account:

Which is great, but Travis CI is already installed and has been activated for all of my repos, so it should be showing me the next step? Refreshing the page and reinstalling the Travis CI github app doesn’t change anything.

Uninstall anything Travis-related from Github and press this button.

You probably have a wrong app installed or something. Just use the stock procedure.