Allowlisting is a security feature that limits sends to only the addresses in your address book.
To add an address:
Acknowledge the allowlisting process.
Select Add address.
Use an Ethereum Virtual Machine (EVM) address for EVM assets.
Enter the address details and select Add address.
Confirm the addition. It takes 48 hours for an address to be available for sends.
After 48 hours, the Date Added column shows the address is ready for use.
You can turn off allowlisting at any time through your address book. This also takes 48 hours. If turned off within 8 hours of activation, the 48-hour hold isn’t applied.