I also have this known issue: empty security question when trying to register for my new oomph mobile account! Need someone to contact me to resolve this so I can manage my new account. Thanks.
Thanks for your post and welcome to our community.
I am really sorry that you're having some trouble setting up your mobile online account, this isn't good.
I'd also like to apologise for the delay in getting back in touch, we have been busier than usual.
This is something we can fix from here, however it will require us sending a personal message and accessing your account.
I'll pop you a message and we can get the ball rolling.