Verify that the user is licensed for Skype for Business Online. In the right pane, select Licenses and Apps.
Go to Users > Active users, select the user that you want to check the license status. Valid Skype for Business userĬheck that the affected users have a valid Skype for Business license with the following steps: If the issue still exists, contact support. If the users can't sign in to Office 365, ask them to try the troubleshooting steps suggested in You can't sign in to Office 365, Azure, or Intune. If the users can't sign in to Office 365, see the Can't sign in to Office 365 section.
If the affected users can sign in to Office 365 portal at here, go to Valid Skype for Business user. One user, or a few users here and there affected Access to Office 365 on the web
The amount of time you spend will depend on the type of Office 365 installation you have, and the root causes of your sign-in issues. Then we'll take you through a series of troubleshooting steps and configuration checks that are specific to your situation. This article will begin by asking you questions about your installation and the symptoms you're experiencing. Troubleshoot Skype for Business Online sign-in issues for admins
