Where would I look to find out if specific pins are disabled?

I’m using an Nuvoton M453 on a custom board. Pins PE_10 and PE_11 don’t seem to work with DigitalIn or DigitalOut. I’ve also tried using nuvoton’s macros and they don’t work either. They did work with other pins that I tried.

I’ve tried looking at PeripheralPins, PeripheralNames files, but don’t seen anything out of the ordinary.

Thanks for your help.