> For the complete documentation index, see [llms.txt](https://docs.bird.com/connectivity-platform/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.bird.com/connectivity-platform/conversations-chat-api/im-not-able-to-send-a-message-to-a-certain-user-id-via-the-api.md). # I'm not able to send a message to a certain User ID via the API Instagram generates specific User ID for each customer that reaches out to you. The User ID for each customer differs per channel. If you try to reach out to a User ID via a different channel then where this was generated, your message will not reach the customer. Let's look at an example below: I own two different brands, Brand A and Brand B, and have a different Instagram channels set up for each brand. John is my customer and likes to shop at both brands. * John has reached out to me via the Brand A Instagram channel, where his User ID was generated as 123456789. * The same John reached out regarding a question to the Brand B Instagram channel, but this time his User ID was generated as 444444444. When submitting your API request, you will need to submit both a **to** and **from** parameter. The **to** parameter will contain the channel-specific identifier (123456789 & 444444444 in the examples above) or a MessageBird Contact ID. The **from** parameter will contain the ID that identifies the channel the message should be sent over. Make sure that, if you are entering a channel-specific identifier, you are entering details that match the right channel. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.bird.com/connectivity-platform/conversations-chat-api/im-not-able-to-send-a-message-to-a-certain-user-id-via-the-api.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.