Valid USPS Tracking Number Error Message

[decadesvintagecompany]

Is anyone else having this problem or know what to do about it?  Everytime I enter a valid USPS Tracking Number into the sytem to confirm a shipment I get the following error message:

The tracking number(s) you entered is not a valid USPS tracking or delivery confirmation number.

Please check the tracking number you have entered. If this is not a USPS tracking number, please choose the correct carrier or shipping service.

A valid tracking number will allow your buyers to track the status of their order and know when to expect delivery. Plus, will help protect you if the buyer files an Item Not Received claim.

Please note that a pattern of entering invalid tracking information may result in a loss of selling privileges or Top Rated Seller status.