I flew with someone a little while ago who had a technical issue with their stuff. I believe the situation was that his email address used to start his app didn't match some other email that was input elsewhere in the process. I'm probably not describing it exactly right, but the point is he had all green checks and everything looked good according to anything he could see but there still was an issue.
After a long while and no results, he contacted the support/IT folks to check. They informed him of the problem, it was corrected and he got an interview within weeks.