The system keeps repeating that my box code is wrong, could it be that my unique box code is case-sensitive?

The box codes are not case-sensitive. The distinction between a capital or small letter does not matter. However, you might have misread the number zero ‘0’ from the letter ‘o’ or vice versa.

We highly recommend copying the code from the invitation you have received, instead of typing it. This might prevent you from entering the incorrect data.

If this does not solve your issue, please contact your care team directly.