You have two issues combined.
Initially, deferred commands stopped working with AI agents. I pointed this out. https://github.com/OHF-Voice/intents/issues/3174
Additionally, you have a collision of two intents, as indicated by the error "no area with the name 10 seconds," meaning your request is misdirected.
You can prioritize the command by creating a local copy as a custom sentences, but this isn’t a complete solution.
In a related thread, we addressed a deferred action issue—you could tweak the script’s code, and that might work for you. These are instructions for implementing three components that will work together. https://github.com/mitrokun/custome_sentences/blob/main/start_with_timer.yaml But be careful with the voice command template in automation so that you don't lose the ability to control devices in rooms.
Unfortunately, lists from the yaml configuration are not supported in the GUI, so it is not possible to implement automation in a neat way. However, you can personalize triggers for minutes, seconds and hours (if required) and run your own script variant via the Choice.