When attempting to use arcpy.mp.ArcGISProject('CURRENT') within a labeling properties class python expression a map drawing alert is generated although the expression is valid. I simplified the label logic to show just the key issue. This technical support FAQ page indicates that arcpy.mp.ArcGISProject('CURRENT') returns the OSError when ran in a standalone environment. I am trying to run this in the ArcGIS Pro labeling properties. This Arcpy documentation doesn't designate that labeling properties is outside of the application. Is labeling properties somehow considered a standalone environment, even though it appears to be within ArcGIS Pro? @ShareUser
I have only seen examples using the LabelClass within the mp module as in the examples here
LabelClass—ArcGIS Pro | Documentation
I don't know if arcpy used to create expressions in the environment you show is possible since it doesn't access a project directly
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