Jaguar XE 2015 EPB Procedure

The parking brake won’t apply while the rollers are turning and the engine/ignition is on so the engine/ignition needs to be off.
Transmission in neutral
Parking brake off
Engine and ignition off
Start rollers and pull parking brake switch

Edit
Just to add to this, had one in today every time I turned the engine/ignition off it put the handbrake on. To overcome with engine running and in neutral run the rollers then turn the engine/ignition off with the roller still running and then apply the parking brake.