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Most likely, if you're dealing with older devices, you'll be using the per-device licensing model. You have 90 days to activate the license after purchase.If it's not activated within 90 days, the license automatically becomes effective on the 91st d...
I tried many possible solutions (checked the Meraki config, the OS versions, my firewall, etc), but realized it was only some client computers that were causing this problem, so I tried your advice. I connected a USB NIC to the computer and it worked...