Before revision:  Our results imply the non-existence of certain rainbow cycles  , and they answer several open questions and conjectures raised in a recent paper by Felsner, Kleist, M\"utze, and Sering.
After revision:  Our results imply the non-existence of certain rainbow cycles , and they resolve several open questions and conjectures raised in a recent paper by Felsner, Kleist, M\"utze, and Sering.