When I try to allow a third-party tool access to my Google Apps mail, I get the error:
Currently this single sign-in feature is disabled for the domain example.com
How do I solve this?
Note: In order to perform this in the New Google Apps dashboard you'll need to:
OpenID authentication with Google Apps accounts are disabled by default. To change this, you need administrator rights to your Google Apps account.
Instructions for NEW Google Apps Control Panel
Instructions for OLD Google Apps Control Panel