Tado reset to its smart plan

Hi there,

When my office light is on I made an autoamtisation to make sure the heater is set to 21 degrees.
However when my light turns off I don’t want to put the heating off but I want to reset it to tado’s smart plan.

What service do I need and how:
I tried:
set_preset_mode and preset auto. But that woudn’t work?