How do I pin OneDrive to dock?

Hi.

I accidentally removed OneDrive from the dock on my Mac. I have tried to pin it to the dock again, but I can't make it work. From what I know, you need to open the app and tap "keep in dock". The problem is, when I try to open OneDrive, it just opens the OneDrive-folder in Finder. The actual app is not shown on the dock. I have tried to pin OneDrive to dock via Finder, but that did not work either: Instead of showing the OneDrive-icon, it was just shown as a folder. Does anyone know how I can pin it to dock again?

Thanks in advance.