This question already has an answer here:

I can't get the flash to fire with flash triggers on. Can anyone help?

  • Body: Nikon D7000
  • Flash: Yongnuo YN-565EX
  • Trigger: Yongnuo RF-603II wireless flash trigger

marked as duplicate by xiota, Hueco, Romeo Ninov, Michael C, Saaru Lindestøkke Dec 29 '18 at 16:20

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.