on signing in I get "a password isn’t enough" screen – but it won’t accept my details

When I sign into hotmail account I get the screen "a password isn't enough" and it requests phone number and alternate email address. I type in my phone number, but it says that this phone number is not valid in this country/region. The problem is that it IS valid - people ring me on that number all the time. How do I get around this problem?