When a Workfront Fusion module returns a 404 error, the error does not give any further details about what caused the error. This is because the 404 error is sent to Workfront Fusion from the application that the module is connecting to, and that application has not provided additional details to Workfront Fusion.
This is an issue with the application Fusion is trying to connect to, and must be resolved in that application.
First reported on August 9, 2022.