Note that the schedule will not automatically be triggered when first saved. It will only ever change based on a scheduled temperature at a time when a change would occur in the schedule. So if your schedule is set for 75 now, but changes to 78 in two hours and you enable the schedule right now, it will not follow the schedule until that change in 2 hours. Be sure to wait until the next time the schedule should change to determine if the power cycle has an effect.
Steps to locally control the removal and add process are linked above, adding them here:
Sending commands in Alarm.com is just putting the panel (in the case of the Concord, the ADC module) in inclusion or exclusion mode, if you do that successfully you still need to perform the steps on the device itself to clear it. We usually recommend using the local steps to avoid time-out confusion. Please try the device removal steps in the link above.