MAJOR Problems Signing into 3 Different email accounts on EVERY device/ USER NAME-PASSWORD INVALID

I cannot login to any of my 3 hotmail/live email accounts on any of the devices that were set up for access.  My username/passwords are always invalid.  I go through the questions/answers and steps necessary to change the passwords. Then I see it's successful.  Then it isn't the next time I try to sign in.  Seems I can't access my accounts on more than one device, and I have to sign out of each account before signing into another.  All these problems started when MS stopped linking the different accounts. I am virtually out of business because of this. PLEASE HELP!!!!!!