Thanks to @Saurabh Sharma this issue is resolved.
For anyone else facing this problem, it was a configuration issue - because the Environment was not configured as a Reference in the SSIS Catalog, ADF would not recognise it for that project.
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I have added an additional Environment to my project deployed in the SSIS Catalog. However the ADF Designer will not pick it up, nor will it execute the package if I put the name of the Environment in manually. I have tried: - Restarting the SSIS IR (repeatedly) - Multiple refreshes of the metadata - Building the process from scratch - Adding a new project (this cannot pick up even the existing environments) It acts like the ability for ADF to pick up Environments from the SSIS Catalog is broken. ![159457-image.png][1] [1]: /api/attachments/159457-image.png?platform=QnA
Thanks to @Saurabh Sharma this issue is resolved.
For anyone else facing this problem, it was a configuration issue - because the Environment was not configured as a Reference in the SSIS Catalog, ADF would not recognise it for that project.