Publish your Notion page in the Share menu

If your Notion page contains any link to another Notion page or database, you also need to publish it or it will not be displayed on your export.

1. Find the Share menu in the top right corner of your Notion page

2. Select the Publish tab and click on the Publish to web button

3. Your page is now Published, you can copy the URL and use it here in Export Notion

Once your export done, don't forget to unpublish your pages!