Unearthing this 4 year old post because I'm having the same problem and I assume the answer is the same, that my device (9411) does not support pattern matching. What does "Supports Pattern I/O? .....Yes" mean then in the specifications page?
If you are using NI 9411 with a cDAQ chassis it will not be able to perform digital pattern matching. However, I believe it states "Pattern I/O" because you could use these I/O ports to route to a digital pattern matching circuit configured onto a cRIO FPGA board