customXmlParts.getByNamespaceAsync is not working for PowerPoint

I have implemented this code to get document Id using, but it is not working for PowerPoint


function getDocumentID() {
        const XML_NS = 'http://schemas.microsoft.com/office/2006/metadata/properties'
        Office.context.document.customXmlParts.getByNamespaceAsync(XML_NS, (result) => {
            if (result.status !== Office.AsyncResultStatus.Succeeded) return
            const part = result.value[0]
            part.getNodesAsync('*/documentManagement/*', (result) => {
                if (result.status !== Office.AsyncResultStatus.Succeeded) return
                result.value.forEach((node) => {
                    if (node.baseName === "_dlc_DocId") {
                        node.getXmlAsync(result => {
                            if (result.status === Office.AsyncResultStatus.Succeeded) {
                                var res = result.value;
                                documentID = res.substring(res.lastIndexOf('">') + 2, res.lastIndexOf("</"));
                                console.log(documentID);

                            } else {
                                console.error('failed to set node text', result.error)
                                showNotification("Error:", e);
                            }
                        })
                    }
                })
            })
        })
    }