Thanks for the information @thewellington.
It looks like you activated the feature right while we’re making a long coming change from netlify.com to netlify.app for internal subdomains. I’m very sorry for the disruption. You can read more details about this change in this other thread: Changes coming to Netlify site URLs: .com to .app
If you change netlify.com in your lfs configuration to netlify.app, it would work as expected.