Wakefield cyclist Melissa Lowther was left "gutted" after an administrative error meant she was left off the entry list for Tuesday's Commonwealth Games time trial.
Team England issued a statement admitting that an "administrative error meant that she was not formally entered into the race".
For the 21-year-old Lowther, it meant that months of preparation work focused on this specific event had come to nought.
"I can't put into words how disappointed I am to have been missed off the start list due to an admin error," she wrote on Instagram.
"It was one of my targets this season to make selection for the Time Trial event and I was so proud that my hard work in training had paid off.
"While Team England have apologised, I'm still gutted not to have an opportunity to represent my country after all the hard miles I've put in."
Team England chef de mission Sarah Winckless spoke to Lowther on Tuesday morning to apologise.
"I personally shared my apologies for missing her out of the time trial today," said Winckless, who said her team had failed to put the proper information into the Games' Sports Entry System, despite 'seven or eight' opportunities to catch the error.
"No athlete should be put in this position because of an administrative error by my group."
England appealed to the Commonwealth Games Federation but that was rejected on Monday night.