I feel the need to report that the cycling computers I bought from lidl in their previous 'event' are crud. I bought two of them...one never worked and the second did fire up, but died a death within 10 miles...useless tbh.
I think the issue may be the shape of the carbon fork on the bianchi...this cheapo computer fitting is to big to fit between the fork and the spokes face on to the magnet...it is therefore only possible to fit it at an angle...which may be stopping it picking up th emagnet, even though it is less than a mm clearance.
Dunno...but I just removed it and decided I don't need the distraction of an unreliable/broken computer while riding.
lost receipt so pays your money takes your chances methinks...