Yes, it was cancelled.
In that case, they must give you the option of a full refund of all course fees. If the course is available later on, the sponsor can also give you the option of rescheduling.
What happens if I don't have a NY state DMV ID NUmber Client ID Number?
That would mean that the ADM course completion could not be applied to your license record. You may also be required to file a Request for Driver and/or Vehicle Record Information form, before you are allowed to take another ADM course.