endorsement vs passport

[Emma]

English Language Tests, Intermediate level

ESL/EFL Test #158 "Airport and flight travel expressions", question 2

It is the passenger's responsibility to ensure their ......... is valid for entry and theyhave fulfilled all immigration requirements in the country of destination.

(a) endorsement
(b) passport
(c) document
(d) papers

English Language Tests, Intermediate level

ESL/EFL Test #158 "Airport and flight travel expressions", answer 2

It is the passenger's responsibility to ensure their passport is valid for entry and theyhave fulfilled all immigration requirements in the country of destination.

Correct answer: (b) passport
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Why is not endorsement?

Emma

[Mister Micawber]

.
'Endorsement' has no meaning in this sentence, Emma-- the sentence is concerned with travel between countries, which specifically requires a passport.
.
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Native English teacher at Mister Micawber's