I finally got off the New Siri waitlist some time yesterday morning, at least on my iPhone 17PM, and there it's working fine, including the app. But it's not working on my Macbook Pro M1 16 Inch running macOS 27. When I try to continue Siri conversations there, which I've started on my iPhone, and even when I start new Siri conversations on my Macbook, Siri keeps responding with "Something's wrong", "There's a problem", etc.
When I was still on the Siri waitlist, I used Terminal on my Macbook to enter the command to supposedly gain access to Siri ahead of being taken off the waitlist, and after that, I no longer saw "Joined waitlist" in Siri's System Settings. But after this when I tried Siri on my Macbook, I got the same failed responses then as I'm getting now that I'm off the waitlist on my iPhone. My assumption has been that after I graduated off of the waitlist on my iPhone, that my Macbook's Siri app would also start working, but maybe that's not how it works. But I'm also wondering if that Terminal command messed something up that needs to be fixed now.