Whenever you boot your server in rescue mode, the console provides a password allowing you to connect on the server.
At this moment, the password given might not work, which prevents the connection in rescue mode on your server.
Next update once we have more information
02.25.20 2040Z (2140LT)
The issue has been fixed. You should now be able to connect in rescue mode without any problem.
02.25.20 2020Z (2120LT)
The root cause has been identified. A fix will be deployed anytime soon.