Brian,
When you say it doesn't work... is the service not displaying in your application?
Runtime 100.9 is needed to make use of MMPKs that have service references in them.
Mark
I have entered an issue for this. The Map load uses the 'first layer in the map to initialize' and when the data source is not accessible it fails to load. To work around this problem put a disconnected layer (a file based layer) as the bottom layer in your map. On map load the app will initialize the bottom layer first and load the map.
To apply the workaround to your map In ArcGIS Pro.
Insert a new basemap
Then add the Basemap layers of your choice to this basemap. Search Online and add...
Then add another file based layer that will be packaged into the map. I would suggest using a Vector Tile Package. I created this one https://www.arcgis.com/home/item.html?id=07b04d145b86410eaf5c5c42a78d8e95 its Level of Detail 1 - just background.
Make sure it is the bottom layer in the map.
Then use this as the Basemap for your Map.
For those that are not using a basemap (its good practice to always have one when creating a Mobile Map Package) make sure your bottom operational layer is in the package, and not a referenced online layer.
Mark
