New Post: SPServices 2013.01 - Test

Hmm. This works for me in my Office365 tenant that's still running SharePoint 2010. It's basically the same as your code with different references to the libraries and my account info.

I did notice that when I forgot to set the account correctly that I got "blank" results because the call gave an error. i.e., I only saw the "This is the output from the GetUserInfo operation:" text.

M.

<!-- Reference jQuery on the Google CDN -->
<script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<!-- Reference SPServices on cdnjs (Cloudflare) -->
<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/jquery.SPServices/2013.01/jquery.SPServices-2013.01.min.js"></script>
<script type="text/javascript">

$(document).ready(function() {
    waitMessage = "<table width='100%' align='center'><tr><td align='center'><img src='/_layouts/images/gears_an.gif'/></td></tr></table>";
    $("#WSOutput").html(waitMessage).SPServices({
        operation: "GetUserInfo",
        userLoginName: "i:0#.f|membership|marc@mydomain.com",
        completefunc: function (xData, Status) {
            $("#WSOutput").html("").append("<b>This is the output from the GetUserInfo operation:</b>");
            $(xData.responseXML).find("User").each(function() {
                $("#WSOutput").append("<li>ID: " + $(this).attr("ID") + "</li>");
                $("#WSOutput").append("<li>Sid: " + $(this).attr("Sid") + "</li>");
                $("#WSOutput").append("<li>Name: " + $(this).attr("Name") + "</li>");
                $("#WSOutput").append("<li>LoginName: " + $(this).attr("LoginName") + "</li>");
                $("#WSOutput").append("<li>Email: " + $(this).attr("Email") + "</li>");
                $("#WSOutput").append("<li>Notes: " + $(this).attr("Notes") + "</li>");
                $("#WSOutput").append("<li>IsSiteAdmin: " + $(this).attr("IsSiteAdmin") + "</li>");
                $("#WSOutput").append("<li>IsDomainGroup: " + $(this).attr("IsDomainGroup") + "</li>");
                $("#WSOutput").append("<hr/>");
            });
        }
    });

});


</script>

<ul id="WSOutput"/>