When printing a First Class mail label, the barcode is missing from the label.
Progistics Management Console (PMC) USPS Server update S
USPS First Class Letter no longer requires a barcode, so the system behavior is correct. Because First Class Letter does not include tracking capabilities without selecting the special service certified, no barcode will print on the label. IMpB only requires a barcode for packages, not letters.
Note: Until PMC USPS update T is installed, there may be some unexpected $0.20 charges. Update T will resolve this.
UPDATED: June 03, 2020