This warning message presents itself under 3 considerations:
1. The model was published from AutoCAD Architecture or AutoCAD MEP prior to Assemble's support of geometry for these two modeling tools.
2. The model was published from Revit but contains objects not recognized by the publisher, such as Parts or Fabrication Parts.
3. Occasionally while working in the project in Assemble and publishing new models, a user may attempt to quickly access a new model after the publisher indicates it is finished. A pop-up warning may occur, indicating that there was no geometry published. This is a false warning. A page refresh fixes it, or refreshing the project inventory page after publishing and before attempting to open the new model will eliminate this situation.