Resetting Equipment for SmartThings Integration

Hello everyone, I’m currently in the process of transitioning from ADT Pulse to SmartThings and have encountered a bit of a hurdle. My ADT Pulse system has been deactivated, which means I can no longer access the GUI to remove devices like my RCS thermostat. I’m wondering if there’s a way to reset my equipment so I can connect it to my SmartThings hub. I’ve tried clicking the remove option in the GUI, but it doesn’t seem to work. Any assistance or tips would be greatly appreciated! I’m really looking forward to getting everything set up with SmartThings and would love to hear your thoughts or experiences with similar setups. Thanks in advance for your help!