FYI guys, remote engine start is not available even in the 2021 X3M Comp with iDrive7. You can have "Preconditioning/ventilation" remotely, but the "Remote Engine Start" option isn't listed in the settings the way it is on the X7...
You can however buy one from a 3rd party for $1000....
https://www.eurostart.com/product/brs7