SSL VPN Portal Policy Not Applying Correctly

Apologies if already posted.

I have this weird issue where when logging in with a VPN User (LDAP) the user always appears to get the default-portal displayed despite having created a portal specified to the user or group it belongs to. I've tried everything I can think of to try and get it to log into the assigned portal but to no avail.

Not sure if I've missed some crucial element or if it is a bug of sorts? I'm hoping it might be an issue someone has come across before. Currently on v5.2.7.