The error below

24-May-2019 04:32:11 : Getting license information

24-May-2019 04:32:11 : Checking Accounting System Details

24-May-2019 04:32:11 : Accounting system details retrieved.

24-May-2019 04:32:11 : Accounting system = 'ACCENTIS'.

24-May-2019 04:32:12 : The content type text/html of the response message does not match the content type of the binding (text/xml; charset=utf-8). If using a custom encoder, be sure that the IsContentTypeSupported method is implemented properly. The first 1024 bytes of the response were: '<HTML><head xmlns=""><meta charset="utf-8" /><title>Accentis Enterprise Gateway</title><style>

        * {

            margin: 0px;

            padding: 0px;

            font-family: Calibri;


        #content {

            padding: 15px;


        #banner {

            background-color: lightblue;

            border-bottom: 2px solid black;

            padding: 10px;

            width: 100%;


        table {

            padding: 10px;


        td {

            padding: 0px 20px 0px 10px;

            vertical-align: top;


        footer {

            font-size: small;

            color: gray;


    </style></head><body xmlns=""><div id="banner"><img alt="Accentis" style="float:right; margin-right:30px" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAALQAAAAyCAMAAADC+gHFAAAABGdBTUEAALGPC/xhBQAAAvRQTFRF///////D///A///A///A//+//P2+/f2++fu9+Pm8+Pm89vi88fS77vK57vK66u+56e646O245+y'.

ended up being that a customer needed a small change to their standard url