This updated script should get your COMs Active and Standy Frequencies and NAVs Standby Frequency to show up in the modules displays if they don't do it with the script that came with the Oi4FS v2.0.
https://1drv.ms/u/s!AjRjRKdTF9fGqrwQVQm ... w?e=I2jPKI
Unzip to the SIOC folder and change the FS_MS A320.ini to point to this new script.