Hi Ivan, Selecting the lookup primary key from advanced mode solved the issue. I was selecting the primary key from simple mode UI. Thanks a lot. As usual silly bugs in adobe platform but hope adobe will fix this.  

Hi Folks, Anyone here used new dataset lookup activity and lookup attribute in condition activity for branching. Adobe Documentation: https://experienceleague.adobe.com/en/docs/journey-optimizer/using/orchestrate-journeys/about-journey-building/dataset-lookup The adobe documentation is not very clea...

Were you trying to use this in journey condition activity? If yes then can you help me with expression as per documentation its @datasetLookup{MyDatasetLookUpActivity1.entities} but not clear how to use this