/usr/mipsisa64r6-linux-gnuabin32/libo32/libnss_nis.so.2 is in libc6-mips32-mipsn32r6-cross 2.27-3ubuntu1cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/mipsisa64r6-linux-gnuabin32/libo32/libnss_nis-2.27.so