Some companies are purposely obtuse about it.

My wife is trying to sort something with a famous Irish airline who are well known for messing people around. She has LPA/POA for her mother but rather than the airline accepting the VCode (this is the UK) the airline are requesting to see the original POA certificate which is just ridiculous. They seem to be moving a little quicker now there is solicitor involved.

Given how much back and forth there has been it's probably cost the airline more than just refunding the amount at the first request. We'll keep going to prove a point.