Since there was no way to contact Andrew from the Dunnas Palace, Lula was unable to tell him about Victoria's proposal. Although Andrew can sense everything that happens inside the Heavenly Palaces, he does not notice Victoria's visit, as he is in a meeting with Oliver and the others, talking about the nobles who attacked them.
Furthermore, in none of the Heavenly Palaces, there is a way to communicate with Andrew. This was a disadvantage since everything depended on Andrew feeling something strange or visiting them whenever he wanted so that his employees could communicate something to him.
Although they could send a messenger falcon, the reality is that from the capital of the Dunnas kingdom to the capital of the Cannaris empire, the falcon would still take 2 or 3 days to arrive, so it was better to wait for Andrew to visit them.
