offers inbound anonymous or visitor

I have followed documentation to show inbound offer for anonymous user on website.

Created webapp (http://instancename/webApp/APP5) in the same instance and added below code

<div id="i_SPC4"></div>

<script id="interactionProposalScript" src="http://instancename/nl/interactionProposal.js?env=liveVisitor" type="text/javascript"></script>

After loading APP5, logged in with admin user, expectation is anonymous offers to load on the webpage, but offers are not getting loaded.

PFA screenshot, After loading webpage (http://instancename/webApp/APP5), I see success response from below urls

1. http://instancename/nl/interactionProposal.js?env=liveVisitor
2. http://instancename/interaction/?env=liveVisitor&ctx=i_SPC4%3ASPC4&z=0.8595316219095246 (2nd url initiated by 1st url) –but the response is empty. Ideally this url should give back offer response , so that it should be filled after <div id=”i_SPC4”> in web form

After drilling down little further, I see  error “JST-310039 Privilege escalation forbidden for 'Anonymous account'. (iRc=-56)” under web logs . This error comes when I hit 2nd url in the browser.

Can someone please help me to understand why offers are not getting displayed for anonymous user and how can I have it working