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API returns the error : “The remote server returned an error: (400) Bad Request”

Issue Symptoms

API returns the error : “The remote server returned an error: (400) Bad Request”

Conditions

Trying to import Custom Fields into an Issue thru the API but get the above Error. The same API file works when referencing a different Project's issues.

Resolution

We discovered the new project did not have the custom form attached under Queue Topics. This prevented the API from being able to add the custom fields. Adding the correct custom form to the Queue Topic, resolved this Error.