arcpy.AddIndex_management error for in_memory variable

I am trying to optimize a script that uses addJoin_management. To do this efficiently, I am attempting to add an attribute index on the join table. I am getting a generic error when i do this though.

arcgisscripting.ExecuteError: ERROR 999999: Error executing function.
Failed to execute (AddIndex).

However, in ArcMap I have created a feature class and added the index and performed the join without any issues. Do In_Memory variables have issues with attribute indexes? I am not sure why i can not create an attribute index on one, or see any indexes listed when I do a arcpy.ListIndexes().

Here is my code, it basically does an intersect, dissolve, calculate acres, join and then re-calculate the acres column to the target table.

print("n*Processing " + f['new_col_name'] + ' acres/pct*')
inFeature = os.path.join(base_path, f['feature']) #the feature class being ran in this loop

# create in_memory variables
feature = "in_memory" + "\" + "mem_feature"
intersected = "in_memory" + "\" + "mem_intersected" #results of intersecting
dissolved = "in_memory" + "\" + "mem_dissolved" #for making a feature class
dis_layer = "in_memory" + "\" + "mem_dis_layer" #for making a layer from dissolved
table_view = "in_memory" + "\" + "mem_table_view" #make a table view for addJoin

arcpy.MakeFeatureLayer_management(inFeature, feature, f['def_query'])

print('Intersecting...')
arcpy.Intersect_analysis([feature, parcels], intersected, "ALL")
print('Dissolving...')
arcpy.Dissolve_management(intersected, dissolved, ["FID_Parcels_2013", "CALC_ACRE"]) #carry over parcels acre field 'CALC_ACRE'. This field may change.
print('Calculating Acres...')
arcpy.CalculateField_management(dissolved, "CALC_ACRE", "!shape.area@acres!", "PYTHON_9.3")
print('Joining Table...')
print('nIndexes:')
indexes = arcpy.ListIndexes(dissolved)
for index in indexes:
    print(index)  #no indexs are seen here??

arcpy.AddIndex_management(dissolved,"FID_Parcels_2013", "ID", "UNIQUE", "ASCENDING")

arcpy.MakeFeatureLayer_management(dissolved, dis_layer)

arcpy.MakeTableView_management(table_path, table_view)

arcpy.AddJoin_management(table_view, "OBJECTID", dis_layer, "FID_Parcels_2013")

#calculate fields from joined table
newfield = 'admin_attr.' + f['new_col_name']
print('calculating new acre field...')
arcpy.CalculateField_management(table_view, newfield +'_acres', "!attr_dissolved.CALC_ACRE!", "PYTHON")
print('calculating new pct field...')
arcpy.CalculateField_management(table_view, newfield+'_pct', "format((!" + newfield +'_acres' + "! or 0)/!attr_dissolved.CALC_ACRE! * 100, '.3f')", "PYTHON")

print('Cleaning up...')
arcpy.Delete_management("in_memory")
arcpy.RemoveJoin_management(table_view)