I recently did a JetBlue app chat to ask for a same day switch to a flight leaving roughly 75 minutes earlier than booked and was denied. I was flying on a blue basic fare and was told it was not possible as, "...it looks like the Blue Basic Fare you purchased is not available for that flight at this time." I was further told, "Because the fare is not available."

I was not aware that fare availability by level Blue Basic / Blue / Blue Extra was a requirement for a same day switch. Instead, I was under the impression that it was merely seat availability. Admittedly, this was my first time trying same day switch and it would not surprise me to find out either of an incorrect chat agent or surprise JetBlue rules based on prior experiences. Was my same day change request possible or was this incorrectly denied?

Thank you