API POST XML problem

I’m trying to do a POST request. The data has to be in XML format.

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I keep getting the same error:

Start tag expected, '<' not found

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I tried this very same request in Postman and Insomnia and it works just fine.

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There is no XML data type in Wappler but does that even matter? I can switch type to plain text in Postman and it still works…