How do you enter 2 sky vue cinema codes on their website to be able to use both at same time?

[Lawrence+22]

I can get the 2 codes from sky ok and copy the codes, but when i try to enter both on Vue i can only seem to enter one, how do i use both at the same time?

[CoffeeDrinker]

You should be able to enter the codes one after the other. Pick your seats, enter the first code. This should discount one of the seats. Enter the second and the second seat should then be discounted:

[Lawrence+22]

Many Thanks, will have another try