Question
What does the error message "Authentication failed due to an improper request; please try again." mean?
Answer
This error occurs when invalid credentials have been used to log in. In other words, your email address, password, or other information you entered is incorrect or not found.
To correct this error:
Try entering your login information from scratch. Avoid any autofill or password manager services in case they have incorrect information saved.
Try resetting your password if you're unsure how accurate it is.
Lastly, clear your cookies and cache.