What am I talking about?
Trying to connect to CRM Online. It happens on occasion that I am denied access to CRM Online when trying to connect from a 3rd party application when I'm certain that my credentials are correct. For example, below is what happens when trying to connect using the Visual Ribbon Editor tool.
Usually I spend time thinking that maybe my URL is incorrect. Maybe I should have left off the http/https. Maybe I should use the Organization Unique Name (appearing under Developer Resources in CRM) instead of the "friendly name" in front of the crm.dynamics.com etc. etc.
The solution of course is simply to delete the LiveDevice.xml file from under the Root\Users\<user>\LiveDeviceID folder and then to try and sign in again... Voila!
Perhaps now I'll remember for next time? Let's hope so...