My phone spins the Siri ball but does not respond

I have the same problem. I either say „hey siri” or hold my side button on iphone, the siri orb appears, I ask my question, the leaf ball thing starts spinning as if there will be an answer and then nothing, it either keeps spinning or just goes away. Works fine on my apple watch ultra and homepod.

Are you asking Siri something when the ball appears? It’s waiting for a question or a command.