How to add Skype4B whiteboard.
If you are changing from Paint 3D in order to show the S4B Whiteboard you should delete the Whiteboard Action Tile from the initial template.
To add the Skype for Business Whiteboard follow steps below.
Setting > Actions > Group Collaborate > Add actions > Add Action from catalog > S4B > Whiteboard
1. Open settings, go to actions and add action (The plus sign +)
2. Add action from catalog, Open S4B and choose whiteboard.
3. Open Whiteboard
4. S4B whiteboard should look like this