Hi @Cristobal_Alarcon, welcome to the community! n8n version 0.204 is rather old I am afraid and there have been several updates to the Notion node since.
Perhaps you want to start a more recent version of n8n using Docker and verify if the problem still persists in the current n8n version? In order to access your existing workflows you might want to check out this example command rather than the official documentation which would use a fresh volume.
Even if it’s not fix you should get more detailed error message from Notion’s API when using the latest version of n8n with the latest Notion node.