Could you go to the Jetpack menu in your dashboard, and make sure that the Single Sign On module is enabled? it seems to be disabled at the moment.
If you didn't deactivate it yourself, is it possible that another administrator did it?
Could you go to the Jetpack menu in your dashboard, and make sure that the Single Sign On module is enabled? it seems to be disabled at the moment.
If you didn't deactivate it yourself, is it possible that another administrator did it?