When you enter a promotional code, you should instantly claim its bonus offer. In case this does not happen, there could be several reasons as to why your code is not working.
The most common reasons are:
Some promotional codes have a limited time in which they can be claimed. Once this time has passed, the code becomes void and cannot be used to claim bonuses.
If you suspect the code might be broken, please contact customer support so that we can look into the matter.