I went back to my room tonight and completed the exchange KYC verification. I got lucky and passed on the first try.

Let me share the method I used. It's really about getting the details right: use a domestic ID card, a China Unicom electronic bill as proof of address, make sure the name matches the ID card, and fill in the address exactly as it appears on the ID card. This combination worked perfectly.

The key is keeping all documents consistent with no discrepancies. Many people get stuck here because their information doesn't match. The ID card name, bill header, and submitted address need to all point to the same person at the same address—then the system's manual review goes much more smoothly. I find the electronic bill method much more convenient than paper statements. You can just take a screenshot and use it directly.