At this time, BookBaby's audiobooks are exclusively available on the BookBaby Bookshop, the internet's most author-friendly bookstore. Sales on the BookBaby Bookshop will net you higher royalties, you'll see the sales info and get paid sooner, and have access to new insight via BookBaby Analytics.
If you'd also like to distribute to Amazon, you retain all rights to your book and files and are free to do so through a channel like ACX. Please note, however, that they explicitly disallow AI-narrated audiobooks.