"Sorry, but we're having trouble signing you in" and "80048163" error when a federated user tries to sign in to Office 365, Windows Azure, or Windows Intune

When a federated user tries to sign in to a Microsoft cloud service such as Office 365, Windows Azure, or Windows Intune from a sign-in webpage whose URL starts with https://login.microsoftonline.com/login, authentication for that user isn't successful. Instead, the user receives the following error message: This issue may occur if the following steps were performed:

1. The on-premises user object is first provisioned by using Unicode characters that aren't supported by Windows Azure Active Directory (Windows Azure AD).
2. Directory synchronization is then run to create a user ID that has the same characters.

To resolve this issue, make sure that the user's user principal name (UPN) contains only supported characters. Sign-in fails if the UPN contains characters that aren't supported.

Microsoft cloud services supports the following characters in the UPN:

• Alphanumeric characters (uppercase and lowercase)
• Period (.) as long as it does not appear directly before the at sign (@)
• Hyphen (-)
• Underscore (_)

For example, the following UPN is supported: However, the following UPN isn't supported:

Still need help? Go to the Office 365 Community website or the Windows Azure Active Directory Forums website.