Answer
You need to wait 5 mins and follow this process step by step
1. Go to withdraw, select token, put the address and quantity then submit
2. Click send besides the 2nd column , and then check your email for verification code
3. Input the verification code from email at 2nd column
4. Input the Google 2FA code at the 3rd column. This code must be put at LAST because of time limit
5. Click Confirm