R-Bridge to ArcSDE throws error (Error in .call_proxy("dataset.open", .Object, path) : cannot open dataset)

[gis-parks-swiss]

I managed to install the r-bridge using your project, thank you very much. I can open features classes of a GDB on my local computer, but I cannot open feature classes which are stored in my password-protected ArcSDE. Is this even possible? if so, what do I need to do? (sorry if this is a dublicate, I tried to post the same thing yesterday but it seems that it wasn't correctly submitted..)

I'm using:
ArcGIS Pro 3.1.0

arc.check_product()
product: ArcGIS Pro (13.1.0.41833)
license: Advanced
version: 1.0.1.305

on Windows 10

My Code
library(arcgisbinding)
arc.check_product()
gdb <- arc.open("C:/Users/xxxxxxxx.SNPDOM/Desktop/to_delete/delete.gdb/parks") # this works
arcsde <- arc.open("C:/Users/xxxxxxxx.SNPDOM/AppData/Roaming/Esri/ArcGISPro/Favorites/xxxxxxxx.sde") # this does not work

Error Message
Error in .call_proxy("dataset.open", .Object, path) : cannot open dataset

original post:
https://community.esri.com/t5/r-arcgis-questions/using-arc-open-function-to-import-a-feature-class/td-p/853116