Getting Users by acquisitionTrafficChannel

[Danny Blaker]

Hi! I hope you are well!

I am trying to get Users (ga:Users) by Acquisition Traffic Channel (ga:acquisitionTrafficChannel).

I've entered in the report generator as follows:

When I run the report I get:

Users by AC1: API call to analyticsreporting.reports.batchGet failed with error: Selected dimensions and metrics cannot be queried together.

I checked the Dimensions & Metrics explorer - they appear as a valid combination. 

Question: Am I doing something incorrect? is there a recommended way to get Users by Acquisition Channel?

Your help is most appreciated!

Thanks very much indeed!