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Trailhead Login Loop
When I try to log in to Trailhead using the "Login Using Salesforce" button in the pop-up I just get kicked into a loop that brings be back to the original Login/Sign Up page, Wash, Rinse, Repeat...
I've tried all of the Usual Suspects:Chrome, Firefox, Clear Cache, Clear Cookies, have another Beer... but no luck :-(

I've tried all of the Usual Suspects:Chrome, Firefox, Clear Cache, Clear Cookies, have another Beer... but no luck :-(
'Problem Logging In
We can’t log you in because of the following error.
REGISTRATION_HANDLER_ERROR: ACCESS_DENIED_eu9.salesforce.com'
I had a demo username - now an enterprise user account. Trying to login with my enterprise username get the error above. Demo allows me in - not helpful.
SF support not interested.
I just tested same, i am able to login. Can you please try now
1. Click "Login" Link => https://trailhead.salesforce.com/
2. Click "Log in with Salesforce" button in pop-up
3. Get kicked back to https://trailhead.salesforce.com/
'Problem Logging In
We can’t log you in because of the following error.
REGISTRATION_HANDLER_ERROR: ACCESS_DENIED_eu9.salesforce.com'
I can only access these pages with my demo account - which expires in 13 days - at which time i assume, my access to any form of help will go with it.
From setup, select Connected Apps OAuth Usage
Install and Unblock the Salesforce Developers connected app
Make sure that the profile or permission set for the user trying to login to Trailhead is listed under Manage App Policies