VLAN's & Unifi

All,Im so confused as to why my VLAN isnt working for my Unifi AP???Okay so ive done this before many times on a different brand of firewall and a slightly different method (see below). But I cannot get it to work at my home? I just cant grasp why?Example of Normal method-

1. Assign a seperate interface on Firewall for Wifi.
2. Give interface an IP of 10.10.10.1, this is what the Unifi AP sits on (admin lan)
3. Create a VLAN using the admin port for wifi, 10.10.20.1 (guest interface) VLAN20
4. Go into Unifi controller, create a admin wifi network using 10.10.10.1, DHCP- 10.10.10.10-10.10.10.100
5. Create second wifi network with VLAN of 20, DHCP- 10.10.20.100-10.10.20.200

That it, it works. Thats all i do.My current method at home (using exact IP's etc)

1. Create VLAN (guestwifi) using LAN interface(192.168.0.1/24)
2. VLAN (guestwifi) interface IP 10.10.10.1
3. Enable DHCP on VLAN- 10.10.10.50-10.10.10.100
4. Launch Unifi Controller, on my DC (admin LAN 192.168.0.1/24)
5. Create network (vlan only) using VLAN20
6. Create wifi network called GuestWifi (VLAN20)
7. Try to connect to wifi network, cannot obtain IP address!!!! grrrr
8. Tag port on my edgemax switch with VLAN20 (port connected to unifiAP)
9. Still no IP Address??

I cant understand why this is? Im clearly missing something obvious....I dont want to use a seperate interface on my firewall as the other 4ports are only 100mb not gigabit.

Screenshots: https://imgur.com/a/Q9l6jvv

NOTE: Posted in another subreddit for additonal help.