vRealize Orchestrator 7.6 HTML5 Workflow Input Values

I'm running into an issue with the new HTML5 UI where either I'm either missing something exceptionally simple or something is very broken.

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I've got a workflow that works perfectly with the old java client to provision a VM and bootstrap it to chef, nothing overly complex. The issue I have it with predefined input options, I retrieve a list of available template VMs with an action that returns an array of VC:VirtualMachine objects, this works correctly and returns the expected array as far as I can tell from debugging/logging.

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In the old UI this is called by the presentation to populate the list of elements for a selector and it works perfectly, in the new UI though I recieve the error (ignore names/variables this is a test workflow):

`Some data cannot be retrieved. If the problem persists, contact your system administrator.; [1][in_0.valueList][com.vmware.library.vc.vm/getAllVMs] Invalid response format. Expected array.`

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It doesn't matter if I create a working workflow in the old UI and upgrade it to the new format or create a new workflow in the new UI it just doesn't work. I can't find anything in the logs on the appliance either that points me in any direction.

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I'm specifying this in Input Form -> Values -> Value options -> External source which I assume is the correct place.

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Anyone ran into this or have any ideas outside of don't use the new UI? (which would be a disappointment!). This is just a lab so I don't currently have the luxury of support, hence asking out on here.