I suspect the issue here is because the Logic Apps CP+IA XSLT Transformation runs in a sandbox, i.e. it is hosted in a separate Azure Web Apps environment and therefore isolated, whereas the Logic App Standard runs within the workflow. The issue is a bit like the Inline Script action where certain JavaScript libraries cannot be referenced.
The issue is currently under review, but at the moment it means virtually no BizTalk map will work. The only ones that will are those with direct field mapping and only use the following functoids:
- all the Advanced Functoids except the Scripting Functoid;
- the Inline XSLT, Inline XSLT Call Template script types of the Scripting Functoid;
- the isNil Logical Functoid.
Until the issue is resolved a workaround would be to write an Azure Function to perform the transformation.