Pages can't be connected to ManyChat currently due to certain issues on Facebook's side.
Incident Report for ManyChat
The bug was fixed on the Facebook's side. We'll be monitoring the situation for some time to be sure that the issue is completely eliminated.
Posted Apr 26, 2019 - 22:53 PDT
We have released a workaround that potentially enables adding new pages to ManyChat - this should help solve the issue in most cases. The problem will be fully fixed when Facebook eliminates the outage on its end.
Posted Apr 26, 2019 - 14:30 PDT
Facebook is experiencing some issues on their side - as a result, users can't connect pages to their ManyChat accounts at the moment.
We're keeping an eye on this situation - more information to follow soon.
Posted Apr 26, 2019 - 08:45 PDT
This incident affected: Web Application.