Hello,
Sorry to hear you are having issues. You will need to
1) Make sure Groupy is enable.

2) Manually group Excel or word or ppoint. Use the way to group as you set. Sshot below show that need to press shift while dragging the program ontop of each other.

3) After the apps are grouped there will be 3 dot tabs to the right of the tabs. Click on it and choose "Automatically group all......"

That should do it.
Basj,
Stardock Community Assistant.