@k4r4b3y The browser should redirect you to the app but for some reason it doesn't happen. A similar problem exists with Fedilab: https://codeberg.org/tom79/Fedilab/issues/814.
It could be a result of some misconfiguration on the Mitra side, but I don't have any ideas about what it might be, so only a client developer could help with this.
For me Husky works fine (it crashes sometimes but at least it can log in). Apparently the redirection works in some browsers but not in others.