This link didn't work for me and instead took me to the general support page. I entered the link microsoft365.com/setup, then chose to enter the license key, that brought me to a page where the key could be entered, then it redirected me to a "Welcome to your Microsoft 365" page. There was a gear symbol link in the upper right to manage my subscription, and when clicked brought me to the error page that stated "Something went wrong on our end. Give it a few minutes, then try again.
TraceID: sXuKaocHqU2aKGSE.11.165" The problem still exists, I am unable to view or manage my subscriptions.
Looks like it's time to pound Microsoft on social media.