If there is a tap in your yard, you should be able to order online.
https://www.att.com/internet/fiber/
In very rare circumstances an address can be missed when they update the database of serviceable addresses. The advice I’ve generally read is that you can have an AT&T COR store open a NAV ticket to have your address verified.
Here are some other suggestions on how to deal with serviceability issues. Not sure how valid/current this information is, though.