Unlocking Samsung bootloaders usually requires to do the date&time trick twice (first - to show and enable OEM button and second to unleash bootloader in practice). You can of course just wait at least full 7 days with enabled network and see if RMM Status changed.
Hovewer I've heard that some Samsung phones from USA don't have unlockable bootloaders, so if you have AT&T phone then possibly your phone might have such problem. Just check that yourself.