Trying to track down the audiobook for 'The Fate of the Kingdom' can be a bit of a scavenger hunt, and I just went through this last week. It's not as straightforward as some bestsellers. My first stop was Audible, and sure enough, it's there. That's probably the most reliable source, especially if you want it synced with your Kindle version if you have it.
I did notice it's also available on Google Play Books and Apple Books, so if you're already embedded in one of those ecosystems, it's a decent option. The narration is by Carrington MacDuffie, I think? Her voice really fits the political intrigue tone, though I've seen some comments online wishing for a more dramatic male narrator for the war sections. To each their own.
One thing to watch—I almost bought an abridged version by accident on a sketchy third-party site. Always check the runtime and publisher details. Stick with the major retailers or your local library's app like Libby. My library had a waitlist of about six weeks, which tells you it's still in demand. If you're impatient, the Audible credit route is the way to go. I listened to it during my commute and the courtroom scenes had way more tension with the voice acting.