Similarly, I published an audiobook on Findaway and it quickly reached all outlets except Audible. Findaway has a note on (my) dashboard explaining there are "significant" delays in Audible. I think that whatever you do, at the moment you still need to provide Audible as an option, so I'm waiting on this before doing any promotions.
I'm guessing it is a flood of AI audiobooks that's causing the problem, but it's also weird. You'd expect that Audible has built in to the AI creation all the necessary parameters to meet quality control. Things like noise floor, room noise, and minimum/maximum volumes are surely automatically applied with the AI? So what's to check?
FWIW, if you want to publish an audiobook in episodes, Spotify would work perfectly and you'll be paid royalties immediately.