According to the website of the Tschafon hut, the street address is Weißlahn 43.
https://www.schutzhaus-tschafon.com/en/schutzhaus-tschafon

This house number OSM ID is missing in the database and not searchable.
Google Maps finds the address correctly.

The OSM ID for the hut itself (way/187287693) displays "9" as road, which seems also wrong.