You will need to contact us to update your address in order to verify your identification.
National Insurance: general enquiries
Once you have changed your address, you should wait 72 hours then try to access the Gateway again.
With regards to paying voluntary National Insurance contributions shortfalls whilst abroad, you will need to complete application form CF83.
Social Security abroad: NI38
You can also provide us with your new address on this form if you do not want to contact us by phone.