IssuedEInvoicesApi: Get e-Invoice XML error

[pasqualefloccari]

Describe the bug
Async method GetEInvoiceXmlAsync returns null string while getting an XML related to an issued e-invoice. If the call is made with method GetEInvoiceXmlWithHttpInfoAsync we get the XML as RawContent and the error "There is an error in XML document (1, 40)".

Env info

• C# version: 12.0
• C# SDK version: 2.1.1

To Reproduce
Please, share with us (if applicable):

• Example code

`var companyId = 1234567; // example
var documentId = 123456; // example

IssuedEInvoicesApi issuedEInvoicesApi = new(config);
return await issuedEInvoicesApi.GetEInvoiceXmlAsync(companyId, documentId, true);`

• Error status and message: There is an error in XML document (1, 40)
• Stacktrace: n/a
• JSON representation of the request body: n/a, the request only includes QueryString parameters

Expected behavior
The method should return the XML.

Screenshots