Tag not monitored by Microsoft.
In Power Automate, the behavior you're experiencing with the outbound action to send an email likely stems from the status reason of the email message record. When the status is set to Pending Send, it appears that the email is not in a state that allows it to be sent through the flow. The action to send an email may only work when the status is set to Draft.
This behavior could be by design, as the system may require the email to be in a draft state to ensure that it is fully prepared for sending. Changing the status to a custom choice like Awaiting Send may not meet the criteria for sending, similar to Pending Send.
For further troubleshooting, ensure that the email message is correctly configured and that there are no other underlying issues with the email setup in Dynamics 365. If the problem persists, consider reaching out to Microsoft support for clarification on whether this behavior is intended or if there are additional configurations needed for different status reasons.
References: