It works now. We're back.

Same here. Same failures on multiple devices.

I've contacted Apple directly regarding how to respond to the new finger double tap gesture in watchOS 10. Apparently we can't. Here is their reply: "there is no supported way to achieve the desired functionality given the currently shipping system configurations." So, apparently when Apple Apps do respond they are using non-published APIs or something the rest of us don't have access to. Maybe someday they'll provide access for developers as well.