I have a Pro license and use TB on both my Macbook and iPhone. Yesterday TB Mobile went into a loop asking me to sign in, I'd sign in with my Gmail account, the 2-step verification pops up on my YouTube app on the iPhone, I say it is me and when I go back to TB mobile, it starts all over again. I've deleted the app, restarted my phone, reinstalled the app - same thing. I'm logged in okay on my Macbook, so I can still use TB for my YouTube channel, but the iPhone app is hooped. WTF?