If you have checked the physical status of your connection to the port on said VLAN. Then you should also check if that VLAN is all the way to the firewall. You can quickly check this by pulling the MAC address table on the end switch where the user is and see if you can find the MAC address of the firewall on that VLAN. It also helps if you start a ping on the firewall to the broadcast address of that VLAN.
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