How to avoid permission denied on shiny server for other users

My colleagues have Setup a shiny Server on debian.

If i create an app and run it, i can see it at : http://ourIP:8787/p/098a4074/.

Goal:

Now, i want to make it visible for my colleagues.

Error:

If my colleagues open http://ourIP:8787/p/098a4074/ they will have to Login and get a permission denied. I cant publish the app outside of our Network.

What i tried:

I tried to give Rights on the Folders where the app files are stored via chmod. But i guess thats not where the app is published.

I tried to find Folders like: p/098a4074.

I feel like i am missing something fundamental and this is quite of a stupid Question. I would be very happy anyway if i could get some pointers.