Upon inquiring about the denial, I was informed that this was a routine check and they requested me to undergo KYC verification up to level 4. Level 4 is the highest level of KYC, which involves providing a picture of my Passport/ID, a personal banknote to demonstrate proof of funds, and a bill to verify my residency. Initially, I found this request rather unusual and tried to obtain a valid reason as to why I was being singled out for verification when I simply wanted to withdraw my winnings. However, the support team was unhelpful, claiming they didn't know the reason or attempting to avoid the question by insisting on KYC verification.
Its so difficult for passing until level 4 KYC, I have been in your position with my account banned due unknow reason and ask on costumer service must pass highest KYC until level 4. Need many document for success until Level 4 KYC from document ID, passport, proof address until selfie for getting back access my account. I give up with rule from Stake because first time we don't required for KYC when depositing fund but they make us difficult choose when withdrawing exactly bigger amount. Hope OP can get back access to your account and ability withdrawing your fund seems bigger fund, for later withdrawing under $1,000 in daily day with possibility without account get lock in the future.