Hey, I've been having the exact same issue. I reached out to support and they told me Credit Karma's Refund Advance page is down and to try again later. However then I spoke to another "tax expert" who had no idea what I was talking about and said if it isn't fixed by tomorrow to call them back, they're going to view my screen to watch what it does. I can update you with what they say tomorrow. I've tried everything even using other devices to file and I can't, has been this way for over 24 hours now.
