iframe displaying in shiny app but not shinytest

Hi! I have a shiny app I developed. Within the app I have one section that uses renderUI({HTML(some iframe code here)}) to display a weather widget. When i runApp, the iframe is displayed perfectly. When I try to use shinytest::recordTests and the viewer pops open, the iframe is blank. This only happens on windows server 2016, R version 3.6.1. I am able to successfully run this on my local macBook using R 3.5.2 and see the iframe in recordTests. Any idea what may be going on? HALP!