BITXOR in RPN mode

[frequencydrive]

I am an engineering student and just got this HP Prime. I am a long time user of RPN and have always used HP calculators. This Prime is taking a while to adjust to.

The calculator is set to RPN mode and I am in HOME

How do I use the command BITXOR(11,12) ? I keep getting "Error: Syntax Error." Even if I put 11 and 12 on the stack (see below) then type "BITXOR" nothing seems to happen. If I use BITXOR(11,12) in CAS mode then I get 7 which is the expected result. But I can't figure out how to make it work in RPN mode.

2: 11
1: 12
BITXOR

then I hit enter and i get:

2: 11
1: 12

That's it. BITXOR disappears and I just have 11 and 12 on the stack as before. What the heck?! Can someone try to use BITXOR in RPN mode and tell me what I need to do to make it work in RPN.