FlyerTalk Forums - View Single Post - Can't change flight via site/app - UA telling me they can't fix it
Old Jan 11, 2022 | 2:35 pm
  #4  
WineCountryUA
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It is best / necessary to let the agent fix this issue and get a valid ticket condition. Once done if you want to do further changes yourself, that will likely be possible. But you need to let the agent "fix it"/ change it to a valid state first.

This is not a new problem, a search of this forum for "We are unable to process your request". yields 100+ posts going back years.
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