Maria,
My client was successful this morning at 10:50am PT (GMT -0700) signing in to Parallels Desktop for Mac.
Did you or other staff do anything?
... or did the situation resolve itself without human intervention?
Please, though, do answer this question:
If one changes or resets the Parallels.com (web site) My Account password, does that have any impact upon any of the one or more licensed copies of Parallels Desktop for Mac sign in password(s)?
Thank you for your personal time and efforts--I very much appreciate you taking the time to read and route this message as needed. 
May God continue to protect and bless you, your co-workers and your families.