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If the device is still connected and you connect to the Spanning tree Root for VLAN8, you should be able to track down the access port for the above mac address
This is standard behaviour for SPAN destination ports. You can't remain connected to the LAN whilst being a SPAN destination port unless you have more than one NIC on your client.
It sounds like that specific AP has a different configuration on it from your standard which is why it works when you configure the switchport as an Access port. Have you tried factory resetting the AP?
