WebPageTest login page custom script


I am facing an issue while authenticating login (live.com) page with web page test custom scripts. This is Public URL and anyone can access this. Here the question is, input box on live.com login page is getting overwritten with background place holder text ‘Email, phone, or skype name’. How can I remove this background text and proceed.

Really appreciate your feedback here.

Here is the custom Script I used for this login scenario.
navigate mva.microsoft.com
clickAndWait id=lbtnButtonLogOn
exec $(".phholder").html("");
setValue name=loginfmt @outlook.com
clickAndWait id=idSIButton9
execAndWait document.getElementById(“i0118”).value=""
submitForm name=f1