Hello.
So, this is an exceptional situation. The problem is that casinos usually list the necessary documents in the terms + add a note saying something like "We reserve the right to ask for additional documents if necessary".
Every casino approaches the KYC verification differently, so no one can assure you once he passes this specific verification he's ok for good.
The ID is an essential document, he should provide it when asked. The passport is more complicated, well what would you say being on the casino's side? Once it's expired, the casino simply sees that as no longer valid.
Did your friend get any official written statement explaining the prolonged validity? Should provide that to the casino.
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