In Confluence, a Blueprint is a set of page templates with added functionality to help you create, manage and organize content more easily. There are many Blueprints included by default, like the "Meeting Notes" Blueprint:
If you provide that template name to the Create Page macro, you'll get an error that says the template can't be found. This isn't necessarily our bug, because we are using Atlassian's TemplateManager to access stored templates. The TemplateManager isn't returning them. It's possible that there might be other APIs out there that we could use (BluePrintManager??).
A workaround I've found is to simply go to Space Tools -> Edit the specific template -> Save. You don't need to make real changes to the template, but editing and saving it seems to make it available to the TemplateManager and thus available to the macro. After doing this, I'm able to type in "Meeting notes" in the template box for the Create Page macro and it works fine.