There are 2 possible reasons why your withdrawals are locked:

• If you reset your password (and you don't have 2FA enabled), change an email, or disable 2FA, we will disable all withdrawals, API keys, and some parts of buying and trading for your account for up to seven days. This is due to security reasons in case your account gets hacked.
• Your account is labelled as inactive. Due to our internal security policy, we instruct our users with sleeping-inactive accounts (accounts that weren’t used for several months) to complete the KYC procedure. This procedure enables us to diligently detect and prevent any malicious or unlawful use or use prohibited by our Terms of Service.