RT - The RT is docked. When needs to mow, turns on, but the robot is not running.

Send the RT to mow manually, either with the Robomow App or by pressing the GO button. Does it start mowing? If it does, it means your schedule is turned off, or all days set as inactive, or mowing hours per day are set to zero. Change all these settings and mower should get back to automatic mowing.