Is this 2nd person plural? And if it is why is it for a singular person?
Vous can be either plural or polite form singular.
The example "vous vous appelez Monsieur Durand" is an application of s'appeler. In this case the gentleman is called Mr Durand, and when stated or interrogated vous (polite singular) call yourself (vous singular) Mr (Monsieur) Durand. Either as a statement or question.
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