When using an SSID that references a tagged VLAN, the client can connect to the SSID but does not get an IP address on the network.
When creating the SSID, the tagged VLAN must be referenced in BOTH the WLAN settings and AP Group settings.
How to fix:
1) Create the SSID in the WLAN settings and assign the tagged VLAN accordingly:
2) In the settings of the AP Group that the WLAN is assigned to, navigate to configuration > network:
3) Change the Ethernet Port 1 setting to Trunk Multiple VLANs and assigned the desired VLANs. The desired client traffic VLANs should be assigned in the Allowed VLANs section. Either specify specific VLANs or a range of VLANs (e.g. 2-4094)