Can't log in Wear OS device -- blank authentication screen?

I’ve installed the HA Wear OS app on my Pixel Watch 2 and it detects my HA instance which I click on the watch and then am told to continue on the phone.

On the phone I just get an empty black screen with the HA logo at the top. I presume I am supposed to be able to log in here?

So if I take a different approach and click the Wear OS settings on the Companion app screen in the Android HA app I’m taken to a screen where I can click Log in Wear OS device. I click that and then click Continue on the next screen. I am then taken to a screen where I can click my HA instance and then I am right back at the blank screen with just the HA log at the top of it.

I presume here I am supposed to authenticate to my HA instance?