There's a couple tutorials below that explain some CB Auto Actions use cases.

www.joomlapolis.com/support/tutorials/107-use-cases

Aside from that it's designed to be self explanatory (there is no documentation for incubator projects). Basically you select the type of action (e.g. Field) then the trigger you want it to fire on (after registration, profile update, etc..) next select the access (everybody is usually best). You can then input substitution support conditions (e.g. [cb_field1] Equal To XYZ) and configure the details of whatever action you've selected.

Please provide a screenshot of your auto action configuration as that's not descriptive enough. Almost always the issue is the condition. Test with the condition removed and it'd likely work. Also regarding the registration triggers the only two you need are: onAfterUserRegistration,onAfterNewUser (this gives you frontend and backend triggering)

First issue is you're using the before and after registration triggers, you don't need both; see my reply above. Next issue is your conditional is not a substitution. You can not put cb_fieldname and expect it to do anything as it must be in proper substitution format of [cb_fieldname]; see tutorials within my signature for further substitution usage information. Once done issues addressed it should work fine assuming your condition matches properly (best to first test without a condition).