Thanks to a few colleagues at work, I figured that there could be an issue with accessing the shiny output via R studio in built browser when accessing it remotely.
The workaround which works for me is to open a new browser via
runApp(shinyobject<-shinyApp(ui, server), launch.browser=T)
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…