You need to re-enable Whiteboard

If you are like me and have been using the preview version of the Microsoft Whiteboard, then you’ll need to go back in and able the non-preview version as shown above.

You’ll find the option in the Office 365 Admin Center under the Services & add-ins as shown above.

If haven’t yet played with Microsoft Whiteboard, what are you waiting for?

Enable Microsoft Whiteboard for your organization