Custom Attribute on Registration Page

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I've some attributes that are part of Profoms that I want to use on the site registration page. This is as a result of preparing for the new GDPR regulations in the UK and needing users to have to opt in allowing us to store their data. There is an Proforms agreement attribute that would work well in this scenario.

Using Attributes Types I've got the attribute on the User Attributes selection list, and successfully added it and it set as 'required'.

When I view the registration page the new attribute appears and also is indicated as required. However when I submit the form to register it doesn't require that attribute, so if it is blank it does not require it to be filled in. However if I then go and log in as the new user it requires me to submit data into that field before I can register. That's great in one way, but it should be validating at registration!

The test link for info ishttps://testsystem.book-in.me/index.php/register/...

Any thoughts appreciated.