@Aussie_Pete 

Hi,
The Tapo camera does not support activating the alarm siren manually now, generally, when the Alarm feature is turned on, the camera will alarm when it detects an event.

Thank you for your feedback here, we certainly appreciate your feedback and feature request. While we don't have any specific details that I can share about if this feature can come to the product or when it might, I'll log the feature request and pass it along to the team to evaluate.
I moved this conversation into the ‘Feature Request (Tapo)' area for better visibility, and if other users have the same request, please vote on this thread or leave your comments.

Best Regards