If you have not used your online account since the new version of the service was launched in July 2018, you will arrive at a ‘Your security details expired‘ page when you next log in.
If this is the case, you should use the on-screen form to create your new Password and Memorable Information. Once you have done this, you’ll be able to access your online account straightaway.
Following the updates to the system that were made in July 2018, it is a requirement that everybody using the online service goes through the ‘Your security details expired‘ process . This means that, even if you have reset your details using the ‘Forgot password?‘ button, if you have not yet gone through the ‘Your security details expired’ process, you will be prompted to do so when you next log in.