The iframe you have tried to embed is currently not from an authorised domain.
https://www.facebook.com/v2.10/plugins/page.php?adapt_container_width=true&app_id=&channel=https%3A%2F%2Fstaticxx.facebook.com%2Fconnect%2Fxd_arbiter%2Fr%2FQX17B8fU-Vm.js%3Fversion%3D42%23cb%3Df3ff829474ac56%26domain%3Dwww.illabo-p.schools.nsw.edu.au%26origin%3Dhttp%253A%252F%252Fwww.illabo-p.schools.nsw.edu.au%252Ff1fb91ec1db7fe8%26relation%3Dparent.parent&container_width=940&height=244&hide_cover=true&href=https%3A%2F%2Fwww.facebook.com%2F685460434813160&locale=en_GB&sdk=joey&show_facepile=false&small_header=true&tabs=timeline&width=500
To discuss the options around adding your content please contact the support team at swssupport@detcorpcomms.zendesk.com.