I had the boarding pass through my app. I went to board and was told to step to the side to talk to another agent because there was an issue. While I waited for the agent, he was handing out boarding passes. Apparently, the e-ticket didn't attach to the record ID correctly. This was a glitch in the reservation system. That's why the gate agent didn't see it. That said, he didn't need to be rude and should have offered to help correct the problem. That didn't happen. When I called Delta it was over an hour wait so I went to the closest desk to talk to a person.