This message may appear when you solve a model with uncertainty and chance constraints using robust optimization, and you’ve checked the box “Auto Adjust Chance” in the Solver Model dialog Platform tab, or you’ve previously viewed the Solver Results dialog and selected the “Auto Adjust Chance Constraints” option. It means that the Solver could not find an improved solution that satisfies all of the chance constraints to the Chance level that you specified in the Solver Parameters dialog. Typically in this case, some of the chance constraints will be satisfied to the level you specified, or even over-satisfied, but others will be under-satisfied.
You may find that the solution is acceptable, but if the chance constraints must be satisfied to the level you specified, further work will be required. You may be able to find an improved solution by manually adjusting Chance measures based on your knowledge of the problem, and re-solving.