Ora was scheduled to sing her latest single I Will Never You Let You Down at the Los Angeles ceremony but it was axed at the last minute because her ex-boyfriend Harris, who owned the creative rights to the song, refused to let her perform the track.
Ora has insisted she is not bitter with Harris about the incident but is annoyed she was forced to let down her fans, who have since directed their disappointment at the music producer.
Harris has now opened up about the dispute, writing on Twitter.com on Wednesday (13Aug14), "You'll only know 1 side of the story re (regarding) Teen choice awards because I choose not to talk to the papers about every aspect of my personal life... But just know I had a damn good reason."
The musicians split up in June (14).