While all these momentous events were happening, Andrew was in his Cannes Palace, unaware of everything that was happening. His information networks were not powerful enough to find out.
While it was true that Zaros could have told him, the thing was that since the appearance of the dragon ancestor and the subjugation of the gray-robed leader of Purgatory, Zaros had not been in Cannes, so there was no way to inform him.
Certainly, Zaros could send a message to Lucian to inform him, but what was happening was too sensitive to send by carrier pigeon, so Lucian really didn't know anything yet.
Zaros and Elidyr, who were closest to Andrew, were currently in the dragons' territory, discussing what had happened and countermeasures with the dragon's ancestor. They had even heard about the dragon kings and Carcom's attack, but it was not the time to inform Andrew, but to take action to see if they could solve the problem once and for all.