I would have thought that running that again would cause an error because the item has already been added to the commandbars collection, which I believe is a property of the database itself. Anyway, are you sure it's not on your Quick Access Toolbar (assuming you have that visible)? Do you see it listed if you go to Access Options > Current Database > Ribbon and Toolbar Options > Shortcut Menu Bar and check that drop down?
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.