We are newly installed in ALTA LAB 6 Pro, but SSID is not showing on only a few computers. The PC’s have a Realtek RTL8192CE Wireless LAN 802.11n PCI-E NIC card and updated drivers, but the issue is still the same.
What do you have set for Channel and channel width ?
802.11n will only be 20MHz or 40MHz and the channel may need to be one of the low ones.
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I would also check compatible channels with your region, and you can experiment with channel bandwidths like @NickShore said. I also just sent you an email. I’m sure we can figure out what’s going on 
It’s already set up to 20 MHz; check with 40 MHz also, and the channel is set to Auto.
