This issue is resolved now, and Horizon should work as usual. Sorry for the interruption!
On 3/19/19 9:54 AM, Andrew Bogott wrote:
Good morning!
As a side-effect of our response to the current gerrit vandalism epidemic, the 2fa integration between Horizon and Wikitech has been disabled. That means that existing Horizon sessions are still valid but fresh logins will fail.
This problem is being actively worked on. In the meantime, don't panic if you get an error while trying to log in.
-Andrew