Hi Lesi,
Thank you for pointing me to the vtpk item. I was able to look into this and found that the API needed to set a parameter to build the initial cache when publishing Vector Tile Packages, that was not being set. We'll include the fix in the next update, but for now (with version 1.0), you can add the following line in gis.py at c:\Program Files\ArcGIS\Pro\bin\Python\envs\arcgispro-py3\lib\site-packages\arcgis\gis.py
line 3027:
buildInitialCache = True
This should resolve the problem.
Thanks,
Rohit