'imbed shiny app into html-markdwon report

i would like to embed the following shiny app into an R markdown report (html): https://agristat.shinyapps.io/Shiny_App_Schlachtvieh/

i have tried several ways to achieve this. for example:


url <- "https://agristat.shinyapps.io/Shiny_App_Schlachtvieh/"
knitr::include_app(url, height = "400px")

or

knitr::include_url("https://agristat.shinyapps.io/Shiny_App_Schlachtvieh/")

however with all these options i run into the same problem: the visualisation of the shiny-app will not appear in the knitted html-file. I have also opened the html-file with an internet explorer (see screenshot). I can select the inputs, but the visualisation will not be drawn.

what am i doing wrong? any suggestions? thanks a lot for any help and kind regards.

scrrenshot of the imbeded shiny-app in a knitted html-file



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