Dec 9, 2018. OsX and iOS device can only find one SSID of the three that are setup in the router. The router is
I have rebooted the router, reset the modem, restarted all devices, powered everything on and off, installed latest router firmware. Nothing works. Still just getting one 5GB SSID. Missing a 2.4 and secondary 5 SSID. All three are shown in the router admin software as active
Correct. Your Shaw service works (internet), your issue is with the D-Link device which Shaw doesn't provide/support.
Was having the same issue with DIR-890L and (knock on wood) seem to have resolved it by resetting the SMC on my Mac as, for some reason, the router was showing up with, at first, a US country code then, intermittently, X0 (Nil) country code.
With the funky country codes it seems that the router could/would not connect to the higher channels of the secondary 5G SSID. Try running a system report on your OSX device (About this Mac) and look at the wifi section to see if your country codes are correct.
Again, this is what worked for me but YMMV.