There are many reasons why your address might not be validated. These can range from missing or inaccurate information to an address that has never existed. Luckily, there are some easy ways to fix invalid addresses. Incorrect data can be easily fixed by manually checking it. Make sure to double check all data when you enter it into the system.
You may be using an old-fashioned typed address. In this case, you can try to validate it manually on the Addresses page or the Address detail page in the Console. In the end, the validation will be more accurate. However, it may take some time for the address to be validated.
The first step is to visit the USPS Postal Pro page and find the appropriate AMS office for your zip code. Enter the zip code you want to add, and then click on the AMS office's contact information. The representative will be able to help you. If the address doesn't pass validation, it's probably not accurate or not within the required locality. If the address is invalid, you can use the API to map it and update your address.
An invalid address can cause your USPS mail to return to you. A valid address must match the official USPS address database. The address database can be accessed through USPS APIs. If your address doesn't match the USPS database, you'll see an error message. This error can occur for many reasons, including a "vacant" status. Moreover, addresses that are new or unregistered, or those that are in a PO box service area, will not validate.