Hi,
Followed this guide:
https://tangentsoft.com/mikrotik/wiki?n ... ns%20VLANs
/interface wifi configuration add
name=guestcfg ssid="Guest" \
datapath.client-isolation=yes \
security.authentication-types=wpa2-psk \
.passphrase=yourGuestPSKgoesHere
/interface wifi add
name=wifi2g configuration=guestcfg \
master-interface=wifi
Created these in GUI.
When Creating Config with passphrase an authentication type. Then creating the WiFi Interface the new interface shows up in device as no authentication requiered.