FortiAuthentcator Guest Portal Auth Error

For the following error:

facauth: ERROR: The AP of portal policy X does not contain client guestwifi.auth.local

It is suggested to add "guestwifi.auth.local" to the Access Point configuration on the FAC, this however is still not working, The Fortigate has a cert configured (Testing Purposes) with a SAN of this name, I am using a Multi SAN certificate so its being used in the FAC and the Gate, I have also applied on the gate:

config firewall auth-portal

set portal-addr "guestwifi.auth.local"

as per the instructions. The guest can register, get approved, gets added to the group and email sent to them with login, but then fails with the error described up, Am losing all faith in this solution, any help appreciated.