When publishing a quick Automation with a Comment Trigger connected to a specific Post/Reel, the "Couldn't create Automation" error message pops up, preventing the publishing.
Also, Story Reply Automations may show a visual error after picking a specific Story; however, such an Automation can still be published and will be working as intended.
We are investigating the matter to identify the root cause.
For the time being, we suggest using one of two workarounds:
1. Switch the trigger settings from a specific post to "Any post or reel", or
2. In the Automations tab, go through the following options: "+ New Automation" -> "+ Start From Scratch" -> "Start from a blank canvas" -> "+ New Trigger" -> "User comments on your Post or Reel" Trigger.
From there, you can choose the "Specific Post or Reel" option without issues.