I changed my Office 365 password o my Windows machines and now I cannot sign into my two iMacs.  It find the account, but when I enter either my old password or my new on, I get a message telling me that "Sign in failed because the password is incorrect or the sign-in name does not exist."  I have had only two passwords, and neither work on the Macs.  There is no message that tells me how to recover ar reset the password.  it basically just lets me know that I am screwed.