pro.arcgis.com/en/pro-app/3.3/help/mapping/layer-properties/choose-unique-identifier.htm

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      Unique identifier fields—ArcGIS Pro | Documentation
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      All layers in the map, including query layers, need a unique identifier. Since query layers can be created from data outside of a geodatabase, an object ID attribute may not always be present. In these cases, you must specify a field or combination of fields from which ArcGIS can generate a unique identifier.

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