Hi @Azwer_Afzal this can happen if your flow is not sending the AI agent’s output back to the user assuming that you have a pattern something like this:
WhatsApp Trigger → AI Agent → WhatsApp Send Message node
Also make sure to have an IF node so that the messages that actually contain some text will be passed to the AI agent.
Also make sure you are using this {{ $json.output }} at the end of the flow which sends the user message curated by AI also consider refreshing those credentials if that helps.