See if this thread addresses your issue:
The AP has a management IP address.
Setting the vlan for an SSID is good, but it does not set the vlan for the APs management IP.
If you're trunking traffic to your APs, you'll probably want to have a separate VLAN for management traffic to the AP.
A separate wifi management VLAN is not mandatory but:
Whatever the APs management IP is, it should be in the native VLAN of your trunk.
Once you've got your APs trunked (and working) you should be able to assign a different VLAN for your Corporate, Guest and BYOD SSIDs