Why doesn't vk.messages.getConversationsById work?

Question

Python

There is this code:

print(vk.messages.getConversationsById(
                        peer_ids = 2000000000 + 1,
                        extended = 1,
                        group_id = id_группы
                    ))

In theory, it should return a chat object with id 1. But for some reason it returns: {'count': 0, 'items': []}, although I know for sure that the first chat exists. What am I doing wrong?