Some N8N chatbot responses not delivering to Instagram via ManyChat

Question

Hi everyone,I’ve built an Instagram DM chatbot using ManyChat + n8n, and I’m facing an inconsistent delivery issue.The flow works sometimes, but for other messages, ManyChat does not send the response back to Instagram, and I can’t identify any pattern. The behaviour is completely random:	No specific keywords trigger failure			No pattern in message length or content			No errors in ManyChat logs			No errors in n8n logs			n8n generates the response successfully every single time			Only ManyChat fails to send it back intermittently	It’s not intentional automation filtering, simply a random fail/pass pattern with the same flow.I’ll attach the details and logs for reference.Setup:Using N8N with Groq LLM to power an Instagram DM chatbot via ManyChat	Workflow: Instagram DM → ManyChat (External Request) → N8N → ManyChat (Send Message) → Instagram	This manyChat flow doesn’t have a keyword or intention recognition; it directly forwards all messages to N8N, which was the main goal to forward all the messages for processing to N8N.	Manychat flow:		N8N flow:		Samples of the DMs:		Could someone please guide me on how to solve this?	Thank You!

Gustavo Boregio · Answer

​@Amra Nadafcheck in Manychat, in Settings > Logs.See if you have any ‘Response is null’ errors.If you do, your n8n automation is taking more than 10 seconds to respond, and Manychat’s external request waits for 10s maximum for a reply.If this is the case, you need to rework your automation and use Manychat’s API to send the response back. There are other posts here in the community showing how to do that.Check if this is the case. If you don’t see any ‘Response is null’ errors then it’s something else that needs further investigation.

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