So I checked in on the UA app, and prepaid for a checked bag. I arrived at EWR and tried to use the bag drop shortcut but was told I couldn't because I didn't have the logo available that showed I was eligible to use bag drop shortcut and "the software wouldn't accept my boarding pass". refreshed and nothing changed. I'm leaving from BOS tomorrow and have already checked in, and I don't have a logo available on my boarding pass. Is it because I'm in basic economy that I can't use bag drop shortcut?