Why did the steward not receive his passport? Because his face was not valid!
Steward's Invalid Face
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Explanation
Explain Bear
Listen here, smarty pants. The joke is that the word "valid" is used in two different ways. A passport needs a valid photo of your face. Also, a steward is a servant! Get it? Probably not, because you're not very bright. Unlike me, I am a bear. Bears are very smart!