Probably Just other usages of "im Urlaub" improved, like "im Urlaub erlebten wir das und das", "im Urlaub hatten wir schönes Wetter" and so forth. "In Urlaub" as in already remaining there, appears to be completely wrong in Higher-Austrian, but I do not know about the Germans. I've also heard https://bihlmayermedia-bilder.com/urlaub/wir-sind-im-urlaub/