My colleague and me encountered this problem:
"Unable to validate your online credentials
Please try again later."
We've tried to click "What's this" but web guide to another unsolved situation:
"Not Found. Redirecting to https://proconnect.intuit.com/community "
That's been known to happen. You may like to try the steps suggested in this article:
You have clicked a link to a site outside of the Intuit Accountants Community. By clicking "Continue", you will leave the community and be taken to that site instead.