@himemsys it doesn't sound like you have adopted the access point correctly, you have to create a new ssid on the controller, when you adopt all the old settings will be deleted, try to reset the ap...

@TOSC it sounds good, you should really be on the Cisco forum but here on the TP-Link forum we try to help. remember vlan must be included all the way from start to finish, if you put a switch in...

@TOSC I configured the exact same network as you from scratch, here is the config ER605 config Switch config Unifi config vlan Unifi SSID everything work reight away. so remove switches you dont have...

@TOSC then you have something between the ER605 and the unifi access points that do not support vlan. connect your SG300 switch directly to the ER605, then connect the access points to the SG300....

@TOSC Configure all ports like GE14 and you done..

@TOSC okay here is a screenshot of a Cisco SG300 in one of my networks, you need to add vlan on the ports that ned vlan, in your case most ports should look like what I have marked. first create vlan...