Investigating - Due to certain issues on Facebook's side, active Click-to-Messenger ad campaigns may not work correctly at the moment: when users interact with the Ad post, "Action Unsuccessful. There was an error delivering your message to the bot." message is displayed. We advise to pause your Click-to-Messenger ad campaigns until there is an update from Facebook. You can track this bug's status here: https://developers.facebook.com/support/bugs/2036838876397123/?disable_redirect=0
Jan 16, 04:54 PST
Update - We've noticed some inconsistencies in Send To Messenger button and Checkbox plugin not working correctly on Safari 12 (possibly older Safari versions as well): Opt-In Messages might not be sent to Messenger after interacting with the button.
We're continuing to monitor the situation - further updates will be posted in this incident.
Dec 11, 07:13 PST
Update - We can see that Messenger plugins are now working on Safari 12. We'll be monitoring the situation for some time before closing this incident.
Dec 7, 02:06 PST
Monitoring - Support for Messenger plugins on Safari 12 has been temporarily disabled by Facebook. This affects web growth tools that use Send to Messenger button or Checkbox Plugin only when the user is using Safari 12.
Facebook team is actively working on addressing this. Unfortunately, they do not have publicly available ETA on this feature.