New crypto withdrawal addresses need to be whitelisted before they can be attached to withdrawal requests for security purposes. The whitelisting itself is multi-factored. You must have access to your email address and 2FA device.
With Liquid Pro open, tap the 三 icon on the left.
Tap on Funds
Tap on Withdraw
Select the currency (token) you want to withdraw from the drop-down menu under Withdrawals.
If this is your first time adding a crypto withdrawal address, follow the on-screen instructions and click Next.
If this is not your first time, you can always add new addresses by opening the drop-down menu for crypto withdrawal addresses and clicking Manage.
Enter the address you want to whitelist and get a 2FA code from your 2FA device, then click Add Address (make sure the 2FA code is still valid before clicking).
The system will send you a confirmation token via email. Copy and paste the token and click Confirm Address. The token will expire after 30 minutes.
If confirmed successfully, the newly whitelisted address will be displayed in your Address list on Withdrawals screen.