For some reasons, I cannot create or modify any award reservations from my Marriott account. Any attempts always end up with the error message "Please try again. If the problem persists, you may call 1-888-236-2427 from within the USA or Canada. If you are calling from a location outside of this area, please consult our worldwide reservation directory for the appropriate number." I noticed this problem during the weekend and I still have it as of today. Meanwhile, my wife's account can create/modify award reservations normally.

I tried to call the number mentioned but the agent had no idea what to do to solve the issue. Any ideas what happened and how to fix it?