Hey,
I wrote an automation that updates an issue after creation. It sends a web request and appends a parameter from the response body to the issue. When I add the response parameter as a comment, it works fine. However, when I try to add the same parameter to a custom field, I get the following error message:
Edited work item successfully, however some of the set fields aren't available. Fields ignored: Test URL (customfield_10743).
The field is available on the issues screen, and when I copy the URL from the comment and paste it manually into the field, it works perfectly.
I used the Edit work item action and selected the field (Test URL).