Facebook Team fixed the bug!
Sep 12, 23:39 PDT
We are waiting on Facebook Team to fix the issue. Meanwhile, suggesting users to follow the Ref URL links from mobile devices may serve as a temporary workaround.
Sep 10, 02:20 PDT
The issue affects only the links clicked on desktop. The links work properly on mobile devices.
We're waiting on the Facebook Team to fix the problem.
Sep 6, 00:20 PDT
Waiting for updates from Facebook Team.
Sep 5, 12:44 PDT
We are continuing to investigate this issue.
Sep 5, 06:22 PDT
The issue is affecting Messenger Ref URL Growth Tool on mobile and desktop. When a user follows the link, Messenger window is opened, but no message arrive and there's no Get Started button.
Facebook is currently investigating this bug. You can watch its status by this link: https://developers.facebook.com/support/bugs/695387230830209/
Sep 5, 06:21 PDT