Sonos Ace Ultra as a room in the S2 app

From the FAQ on the product page:

How do I link Sonos Ace Ultra to my system?

Headphone linking requires a WiFi connection and at least one of the following speakers in your Sonos system:

Beam (Gen 1)
Amp
Arc
Arc SL
Five
Roam
Roam SL
Roam 2
Beam (Gen 2)
Ray
Era 100*
Era 100 Pro*
Era 300*
Move 2
Arc Ultra
Sonos Play
Era 100 SL*
Beam Ultra

*Not being used as a rear surround for home theater

So guessing it would not link to a turntable hooked up to 2 Sonos Fives? I guess not sadly even if a speaker from the above list was also owned.

I've seen that. But I also saw (just below your quote):

Selecting audio content for headphones

1. You can select content to play directly to your headphones by navigating to the System tab and selecting your Sonos Ace Ultra.
2. Once selected, navigate to the Home or Search tabs to select content.
   1. Content changes may take five or more seconds to begin playing and show within the Now Playing screen.

Hence my question: does the Sonos Ace Ultra require another Sonos component from the list, or does it function just with the app?

I mean it’s already self-explanatory. You need a compatible player in order to link Ace Ultra to your system.

This is also confirmed in the following support page: https://support.sonos.com/en-gb/article/set-up-headphone-linking

Yeah I think I get it. Ace Ultra will only link to a speaker on that list and not some of the older ones. Odd that the Move listed is not the Move 2? Maybe that’s a typo!

Yes, you can link the Ace Ultra to any compatible speaker be it stand alone or stereo pair even those with a turntable.

Once linked you can move about your home freely as the Ace Ultra will be using your WiFi. 

During the link it becomes a room on your system and is subject to the 32 device limit.

It is not a room when not linked. 
 

Edit:

It’s important to read the information in the link as well as the attachment (Note).

https://support.sonos.com/en-us/article/known-limitations-with-headphone-linking
 

On balance, I will probably stick to my current Ace headphones as I mostly use them out of the house and for podcasts via my phone or with my Beam 2 for TV. The main system in my house I’d be interested in using them would be my turntable but it’s connected to a set of Fives so that would not work anyway. Luckily I got them via a sale here in the UK a few months ago for the now set price of £299. Would be pissed if I had paid the £100 more as was the normal price at the time. The only thing I would have liked is that new Stone colour but I ain’t paying £100 more just for that 🤣

What? Did you not read my post throughly regarding a turntable. 

Sorry I am a bit confused lol. So if my turntable is linked to a set of Fives, how does that swap to the Ace Ultra if it’s not on the list of supported speakers? Is it the fact that I own another speaker that IS on the list means the Sonos Fives would link? That is the bit that is confusing me haha

On the list mentioned in this thread I see the “Five” listed as a linkable speaker. Don’t you 🤔