Wait out one hour. Clear your browser. Reboot your device and open one tab only in private/secret/incognito mode using Firefox, chrome, safari or edge work best.
Try again. If it still fails then contact customer support for a "password reset".
@douellet_90 did you ask your mom to confirm the answer ? ::)
it is possible it was key in wrong in the beginning. If so, you might want to open a ticket with PM to reset the logon credentials, then you can re-setup the security question.
Use the Chatbot on the lower right and then start by typing "Forgot Login credentials"