Implement password max length restriction on the Update your password page
The 16 character password length restriction is undesirable, but Windows 10 Phone mail cannot connect to an account with a longer password. Once you enter more than 16 characters, the sign-in button just pops up the keyboard without submitting the credentials. Until that is addressed, the restriction is needed.
The normal password change page prevents the user entering a password that is too long, but the "Update your password" page which is triggered if you do an Admin password reset and require the user to change on first login does not implement the restriction. A user can enter a much longer password - I have used a 48 character password.
Th long password seems to work for all purposes except Windows Phone where the sign in does not work. There are no error messages to indicate why it will not work and if the password is not obviously very long it can be difficult to work out why a particular account cannot be accessed from Windows Phone.
This page needs to be corrected to be consistent with the normal password change page.
The hardcoded 16 max char lenght is a joke. My account was always a cloud account and I had 30 chars before I was forced to change.