CC Mobile Sync Sign In

I'm unable to get Lightroom CC 2015.8 to sign into Mobile to Sync to/from mobile apps.

Lightroom's Help menu says I'm signed into my CC account. The name placard says "Get started with Lightroom mobile" and "Sync with Lightroom mobile (Sign in)". Preferences -> Lightroom mobile says "Adobe ID: Not signed in".

Creative Cloud 3.9.5.353 freshly installed. Only Lightroom is installed.

I've done the following with no success:

• removed Lightroom and reinstalled
• removed Creative Cloud and reinstalled
• removed all CC apps, ran CC Cleaner on All CC apps and Adobe ID credentials
• read these threads:
  • lightroom mobile on desktop app, won't sign in
  • Unable to login to Lightroom Mobile  (My CC is teacher/student but purchased through Adobe.com)
  • Problems with mobile sync sign in
  • Re: Do I really have to sign back in to Lightroom mobile every time I start? (Can't sign in at all)
  • Lightroom mobile won't sync anymore-Says to sign in (CC is open and running and syncing TypeKit)
  • Can't sign in to Creative Cloud Desktop application...
  • I can't get the sign in screen in login mobile. When I click sign in , it goes to the 'connecting screen' right away. It…
  • Cannot sync Lightroom Mobile / Cannot connect with desktop app
  • Edit/preferences/lr mobile tab say not signed in?
• Creative Cloud signs me out or asks me to sign in repeatedly

Windows 10 Pro 1607. Full Creative Cloud membership. Adobe ID password reset. Lightroom mobile sync between iPad and Android phone works. Typekit syncing works.

What else am I missing? I'd like to be able to sync to mobile to share photos in person.

Thanks in advance!