well for a start, since you have vcds access run the readiness test.....then report back
With the EGR hysteresis values zeroed out, that effectively turns off the trigger in the ECU. As such, the ECU doesn't run the EGR and an "incomplete" or "failed" status appears. Running the readiness in VCDS probably won't do anything due to the reason above. I'll give it a shot sometime this week though.