Bonjour
The correct sentence is "Nous devons vous quitter" that means "We must leave you". The other sentence is not correct.
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Hi again, Feng.
Both expressions are grammatically correct but they do not mean the same thing:
Nous devons vous quitter = We must leave you
Nous devons quitter = We must leave
As you can see, "vous" (you) is what we must leave.