Firstly, please clear your browser cache and cookies, refresh your browser and try accessing content again; instructions on how to clear your cache and cookies can be found at the following links:
Mac / Safari: https://support.apple.com/en-gb/guide/safari/sfri47acf5d6/mac
iPhone / iPad: https://support.apple.com/en-gb/HT201265
Internet Explorer: https://support.microsoft.com/en-gb/help/17442/windows-internet-explorer-delete-manage-cookies
If you still have issues, please check for any updates available for your current browser and make sure cookies and third-party cookies are enabled.
If you have the same issues after trying those suggestions please try using an alternative web browser (i.e. Google Chrome, Mozilla FireFox, Safari and Edge) to eliminate any browser specific issues.