2 requirements for the dialer codes to work:
Stock Samsung dialer
Several system apps which are used when running the codes. An example would be keychain.apk and SecFactoryPhoneTest.apk. there are more than these two though.
These are often removed from debloated roms meaning some if the codes will not work.
Not sure if they are removed from this rom, but if the codes aren't working, I'd suspect at least some are.
Stock Samsung dialer
Several system apps which are used when running the codes. An example would be keychain.apk and SecFactoryPhoneTest.apk. there are more than these two though.
These are often removed from debloated roms meaning some if the codes will not work.
Not sure if they are removed from this rom, but if the codes aren't working, I'd suspect at least some are.