search my content only returns publicly shared items

[PeterMacKenzie2]

I am using the The ArcGIS Notebooks public beta for ArcGIS Online, I am following this documentation:
Accessing and creating content | ArcGIS for Developers . 
When I search for content, it only returns publicly share items? What am I missing here?

my_content = gis.content.search(query="owner:" + u,
item_type="Feature Layer",
max_items=15)

my_content

(where u is my username)