Question at the beginning of the guarantee for reimport from DK via D to A

Hello everyone Since the topic is not type-dependent, I would like to post it without a choice of type, hope it works. The following case: We bought a Yaris in Austria in September 2024 from a free German importer, which was delivered by Toyota to a Danish Toyota dealer in March 2024. This had a vehicle pool, from which the free dealers then supplied themselves on demand. Toyota Austria now believes that the manufacturer warranty begins with the delivery to the DANISH Toyota dealer. Thus we would lose a half year manufacturer warranty. Does anyone of you have a source where we could check that? That seems very strange to us. Thank you!