How Can I Set a Youtube Video to Autoplay Using R Shiny?

Question

I'm using this code which will accept a Youtube URL and play the video in the RStudio viewer pane, rather than in a popout browser. It does exactly what I need it to do except that I would like it to autoplay when the function has run. I've seen a few other examples ( Like here and here ) where folks insert an allow = autoplay or something similar in the UI's fluidPage command but I haven't gotten it to work for me. I have additionally tried adding ?autoplay=1 to the URL, as described here, which works generally in any browser but seems to be ignored by R. Here's an example to replicate with:

videoplay <- function(url = "https://www.youtube.com/embed/wpHQnCaAJv8")
  
{
  library(shiny)
  xy <- c(784,479)
  url <- gsub("watch\\?v=","embed/",url)
  ui <- fluidPage(
    HTML(paste0('<iframe width="',xy[1],'" height="',xy[2], '" src="', url,"?autoplay=1",'" frameborder="0"></iframe>'))
  )
  server <- function(input, output, session) {
  }
  
  runGadget(shinyApp(ui, server,options=c("launch.browser"=FALSE,"port"=1111)),port=1111,viewer = paneViewer())
}

Does anyone know how to make this video autoplay when the function is run? Appreciate any help!