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Hi @Mike PHAM
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Based on Office 365 Outlook - Connectors | Microsoft Learn, the behavior you are seeing is expected. The documentation explicitly states that"Send an email (V2) does not return message id" and that there is no way to get the Message ID when sending a message using this action. As a result, the Message Id required by Reply to email (V3) is not available in the dynamic content from Send an email (V2).
If your flow needs to use Reply to email (V3), you will need to obtain the Message ID through another method, such as retrieving the sent message from the Sent Items folder using Get emails (V3) and then using the returned message Id in the reply action. You can refer to this discussion Solved: Get Message Id for Reply Email in Flow
As this forum does not currently have a dedicated Power Platform tag, you may receive more specialized assistance by posting future Power Platform questions in the Microsoft Power Platform Community. It is an active community with many knowledgeable members and experts who are happy to share their experience, provide step-by-step guidance, and help troubleshoot issues. You're likely to receive more targeted support and clearer recommendations there.
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