Well, the indicator lights on the Dash - also need to come on - like your going into IGN mode.
In the US, turn to ACC first, both pedals to the Floor - then turn to the IGN - needs to be on, but not started
When you don't hit the Brake, it may think you just want ACC...
So, then in that case,
Try this link...
https://resetservicelight.com/reset-oil-service-light-ford-fiesta/
Read Thru, apparently the Push to Start ones, needs you to be...
Both pedals to the FLOOR then bring up ACC and HOLD down BRAKE and THROTTLE for 20 seconds - then ACC to off.(START pressed for STOP) Forces the CLEAR condition - then release pedals - or it may need to have you Release pedals after holding down for 20 seconds - following the same procedure, but keep ACC ON to allow time for the CLEAR condition to occur (ECM needs power on for this)
That's their method - see if it works.
The condition here is to make the vehicle "see" a different "start condition" than normal - being Key present, and ACC or IGN off, both pedals off
- your usual start up - the typical - key or press, then Brake or Clutch engage that lets the vehicle do a start-up routine of starter to crank crank signal - check Engine condition and once engine starts begin run sequence. One pedal, Brake or Clutch - are pressed.
The effort here is to press and hold both the throttle and Brake down - then the car sees that condition and re-sets the light(s)