I can’t send xml to url request

I can’t send an xml message to the url that I need to send using axios, I made the header settings (text/xml , application/xml) but unfortunately the request does not arrive and I get a response that the request is empty

XML:
`


    if(req.body.Status === 'Y' || req.body.Status === 'A'){
        const reqUrl = 'https://onlineodeme.vakifbank.com.tr:4443/VposService/v3/Vposreq.aspx'
        Server.getAllData('paytr') // get some data from the DB
        .then((result) =>{
            var uniqueId = req.body.VerifyEnrollmentRequestId
            var newUniqueId = new Date().getTime()
            var uyeNumarasi = encryptedData.decrypt(result[0].merchant_id)
            var uyeSifresi = encryptedData.decrypt(result[0].merchant_salt)
            var teminalNo = encryptedData.decrypt(result[0].merchant_key)
            var ammountResult = req.body.PurchAmount / 100
            const ammount = ammountResult + '.00'
            var resBrandName = '300'
            if(req.body.Pan.startsWith('4') ){resBrandName = '100'}
            if(req.body.Pan.startsWith('5') ){resBrandName = '200'}
            var resCreditCardNumber = req.body.Pan
            var ResCurrencyCode = req.body.PurchCurrency
            var resExpiryData = '20' + req.body.Expiry
            var clientIp = req.body.SessionInfo.split(',')[0] //''
            var CAVV  = req.body.Cavv 
            var eci = req.body.Eci
            var CVV = req.body.SessionInfo.split(',')[1]   

            var sendUrl = `
            <prmstr>
            <?xml version="1.0" encoding="utf-8"?>
            <VposRequest>
                <Cvv>${CVV}</Cvv>
                <TransactionDeviceSource>0</TransactionDeviceSource>
                <MpiTransactionId>${uniqueId}</MpiTransactionId>
                <ECI>${eci}</ECI>
                <CAVV>${CAVV}</CAVV>
                <ClientIp>${clientIp}</ClientIp>
                <Expiry>${resExpiryData}</Expiry>
                <TransactionType>Sale</TransactionType>
                <MerchantId>${req.body.MerchantId}</MerchantId>
                <Password>${uyeSifresi}</Password>
                <TransactionId>${newUniqueId}</TransactionId>
                <TerminalNo>${teminalNo}</TerminalNo>
                <CurrencyCode>949</CurrencyCode>
                <CurrencyAmount>${ammount}</CurrencyAmount>
                <BrandName>200</BrandName>
                <Pan>${resCreditCardNumber}</Pan>
            </VposRequest>
            </prmstr>
            `
            
        
            axios.post(reqUrl , sendUrl,
                {
                    headers: {'Content-Type': 'text/xml'}
                })
                .then((dataUrl) =>{
                    res.send(JSON.stringify(dataUrl.data))
                    console.log(dataUrl)
                })
                .catch((err)  => {
                    res.send(err)
                })
        })
       

`

Thanks in advance for your help