Users could onlylogon once after reset the password of the mailbox
After Users reset the password of the mailbox, users couldonly logon once; after the logout, the second logon will fail with the errormessage invalid account.
The root cause of this issue might be the compatibility ofbrowser.
Change the browser to Internet Explorer. After that, themailbox access is good without problems.
Note, Try to use internet Explorer when navigating to Microsoft Online Service website.