we don't know the main reason why BC game do this, but one thing for sure they will have the reason on this and we don't know what. Maybe they need more ID's to send with them in order r to proceed to payout but for me after sending the passport or any government IDs then that's Enough to complete the KYCS
It is mentioned by the BC.game support the reasons why driver's license is not accepted on their end now, that's why they need the updated passport id which OP has is an expired one and need to be renew. Usually, most powerful and useful IDs are national ID, passport and driver's license, the rest are just secondary IDs.