Hi @Anonymous ,
Based on issue that you mentioned, I think you have some misunderstanding with the data storage representation within PowerApps app.
According to the correct response you mentioned (last screenshot), I think the dll property owns a Object value. When you executes your action within a canvas app, the Object value the dll property returned would be recognized as a Record type. Then within the variable, the dll property would be rendered as below ("table" icon):
you could click the "Table" icon as above to see the detail values within the dll property.
Actually, it is a normal behavior that the Object record would be redered as a "Table" icon as above when your variable or Collection contains a Object value.
If you want to reference the column values within the dll property, please take a try with the following formula:
AddActivity.dll.retval
AddActivity.dll.BUSSINESPARTNER
AddActivity.dll.EMPLOYEE
AddActivity.dll.SUBJECT
AddActivity.dll.LOCATION
AddActivity.dll.STARTDATE
...
Note: The AddActivity represents the variable you set in your app.
Currently, within PowerApps, only simple type column value could be displayed within a variable or Collection directly (e.g. the status property in your response), the complex type (Object, Array, ...) column would be rendered as "Table" icon as above.
Best regards,