How to resolve this?
To access the other account, click the ‘Sign Out’ button in the top right-hand corner of your screen (in the drop-down list when clicking on your initials). This will bring you back to the original login page.
Please then try logging in using your other details (i.e. if you logged in with your mobile last time then log in with your email this time, or vice versa, or use a different email address), and the account should appear there.