Struggling to enroll samsung A8 tablet

Struggling to enroll samsung A8 tablet

Hi Folks,
Signed up the MDM plus cloud service but cannot get our samsung a8 tabs to enroll via EMM

It scans the code fine but i receive an 'unable to connect to server 443' error near the end of provisioning. The tablet boots up, it will have downloaded the MDM app. But wont show as a device on our portal.

I have tried on 3 different networks.
With the 6.0 and 9.0 EMM qr code

I have also ran the AFC test by typing it into the google account. Which is apparently passes fine.

Am i missing something really obvious?
Do i need to do anything on the portal first?

                  New to ADSelfService Plus?