Description
When all of the values for an analysis field are the same, the tool cannot use that field in the algorithm. The field will still appear in the output feature class.
Solution
This is a warning and may reflect expected behavior. Workflows that iteratively decrease the number of features analyzed, for example, may lead to a set of features that have all the same values for Analysis Fields. If you weren't expecting this message, review the Analysis Fields values you selected to ensure that they have a variety of values that the tool can use to partition the features into distinct clusters.