What about "Er ist auf Tour gegangen"?
Seems ok. Should be accepted. If not, report it. I can imagine someone saying: "Er ist mit seiner neuen Single letzten Herbst auf Tour gegangen." = "He went on tour with his new single last autumn."
Wrote the same ;)
It shouldn't be accepted because that's perfekt, this lesson is on präterum
It should, because one can easily get this question in an exercise, out of any lesson's context.
Why "die Reise" is wrong?