Headlight alignment problem

Jan 25, 2023
Long story short my Seat Ibiza FR 2017 67 reg failed MOT 4 weeks ago at SEAT dealership as headlight not alligning on one side.
They have replaced the complete headlight (full LEDs) and control unit. Cannot get the authorisation code provided by SEAT to work or talk to the headlight so therefore new part is not working. They have taken it to local VW garage today with no success.
Any advice what to do next?
thank you in advance
Letchworth SEAT - car sales sponsor