Everytime I try to log in to my email I get this: “That password is incorrect. Be sure you’re using the password for your Microsoft account.” I have to get a new password before I can check my emails.

Every time I try to log into my email I get this: "That password is incorrect. Be sure you're using the password for your Microsoft account." I have to get a new password before I can check my emails. I have already changed my password 5 or 6 times!! I am using the correct password! My son is having to do the same thing on his account. How can this be fixed?