If you want to use an HDBSCAN algorithm on graphs then I suggest you look into Spectral Clustering (which traditionally uses K-Means, but could use HDBSCAN inst

If you want to use an HDBSCAN algorithm on graphs then I suggest you look into Spectral Clustering (which traditionally uses K-Means, but could use HDBSCAN instead. Otherwise you may want to consider graph specific algorithms such as Louvain.