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From what I’ve seen, a normal login can simply involve the registered email and password, while additional verification may appear when there’s a security or account-related reason. SpinDog information also mentions two-factor authentication as an extra protection option. If you’re checking official spindog uk, I’d keep the registered email and phone available in case the account asks for another confirmation. Identity documents are more commonly associated with account verification and withdrawals rather than every routine login, so I wouldn’t expect to upload ID each time I sign in