If you are trying to withdraw your Bitcoin to your Bitcoin wallet, please use a valid Bitcoin address. It can begin with a 1, 3, or bc1.
Please make sure you copy-paste the address directly from your wallet to avoid typos. Also, make sure you have not included extra spaces either before or after the address. If you're still getting a rejection it's likely that a typo is causing you issues and our service is automatically catching the typo before we accept the address.