Issue - Awareness Program 'Invalid Request and has been restricted'

Hi Folks

We added some people to an LDAP security group we use for our security awareness training on Friday. As normal the cron ran on the Saturday morning and sent out the mails to the people who were added inviting them to take part in the training

I have spoken with the particular user today and when he clicks on the link to be brought to the portal he logs in as normal only to see the follow message

As you will see from below the program is still up and running so I am guess the page should be still there when the user goes to login

We have implemented this mornings update so are on the latest version, am I doing something wrong ?