There is no evidence that du’aa’ made when seeing the Ka’bah is answered

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Check below answers in case you are looking for other related questions:
How can he seek the forgiveness of one who has died?
Should a person call upon Allaah even though Allaah knows his needs?

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Related Answers:
Is there such a thing as Du’aa’ Kanz il-‘Arsh?
Du‘aa’s for relief from worry and stress
Saying du’aa’ al-istikhaarah without praying
How can he seek the forgiveness of one who has died?
Should a person call upon Allaah even though Allaah knows his needs?

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