I'm very disappointed that the Galaxy watch ultra isn't compatible with the Facer app my guess is this was a move by Google to force wear os users to purchase watch faces from the play store where most of the faces suck.
Thank you for reaching out. I can certainly understand the importance of wanting different applications for your watch faces. I was able to test on my watch and the Facer app states "Your watch only supports Watch Face Format. We're working to bring the full Facer Catalog and experience soon." Give this link a try for more information: https://community.facer.io/t/important-pixel-watch-3-samsung-galaxy-watch7-ultra-compatibility/93887
