Hello everyone,

I'm hoping to get some help from the community, as I've hit a wall with an Instagram API issue and I'm completely out of ideas.

My Goal: I'm building a bot that uses an external service (Make.com with OpenAI) to generate and send replies to users. Everything works perfectly inside the 24-hour window. The problem is sending messages outside that window.

Here's what I've tried (my troubleshooting journey):

1. Official Make.com Module: I started with the standard "ManyChat" module in Make.com.
   • Result: The module reported status: success, but the message was never delivered to Instagram. I assume it was silently blocked by Meta for a content/tag mismatch.
2. Direct HTTP API Call: I then switched to a direct API call to https://api.manychat.com/fb/sending/sendContent to get more control and see the raw errors. This is where it got strange.
   • Using HUMAN_AGENT tag: When I use this tag, the API immediately returns a 400 Bad Request error with the message: "Unsupported message tag".
   • Using CONFIRMED_EVENT_UPDATE tag: As a test, I tried this tag instead. The API call works perfectly and returns a 200 OK status. However, the message is still not delivered to the user in Instagram.

My Conclusion:
The problem doesn't seem to be with my setup in Make.com. The core issue is that the HUMAN_AGENT tag, which is the correct one for my case, is being rejected by the API as "unsupported" for my account specifically.

My Question for the Community:

Has anyone ever encountered this specific "Unsupported message tag" error for HUMAN_AGENT?

Is it possible that this feature is disabled for certain accounts by ManyChat or Meta? I'm at a complete loss for what to try next.

Any ideas, suggestions, or similar experiences would be hugely appreciated!

Thank you!