Late by more than a year but will help future visitors …
Check the Designer logs as mentioned by @PGriffith , in my case I saw this:
By default the Journal name is Auto but it does not work so I have to give it the journal name as configured in the Gateway webpage:
![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/2/c/2cfeca7d08bf85117d1215fcac5b7b9adb542a51.png)
![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/1/c/1cf25447528bd61c569e0bba65623a36f8fd17c4.png)