IAR EW 8.11.1 does not link the nfc samples from sdk 13.1. There are different sizes for wchar_t:
Error[Lt009]: Inconsistent wchar_t size nfc_t2t_lib.o(nfc_t2t_lib_iar.a) has wchar_t size 16 bits app_error.o and 38 other objects have wchar_t size 32 bits Error while running Linker