Turned off icc buff, can we get it bac

Q u o t e:
Have everyone leave the instance, then "Reset all Instances"

That would probably be the best course of action. Though you may need to perform a soft reset if that does not work.

To perform a soft reset, follow these steps:

-Have the entire party/raid exit the instance.
(Please note that players who remain inside the instance, even those who are logged out, will prevent this workaround from functioning as it should)
-Wait at least 30 minutes while every raid member remains outside of the instance.
-Re-enter the instance only after 30 minutes have elapsed.

When you re-enter the instance after completing the soft reset, all scripted events that your raid has not yet completed should now be reset and you should be able to continue raiding where you left off.