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We utilize a sample of 34.6 fb$^{-1}$, collected by the Belle II experimentat the SuperKEKB asymmetric energy $e^+e^-$ collider, to search for the $B^+\to \phi K^+$, $B^+ \to \phi K^{*+}$, $B^0 \to \phi K^0_S$, and $B^0 \to \phiK^{*0}$ decays. Charmless hadronic $B$ decays represent an important part ofthe Belle II physics program, and are an ideal benchmark to test the detectorcapabilities in terms of tracking efficiency, charged particle identification,vertexing, and advanced analysis techniques. Each channel is observed with asignificance that exceeds 5 standard deviations, and we obtain measurements oftheir branching ratios that are in good agreement with the world averages. Forthe $B \to \phi K^*$ modes, we also perform a measurement of the longitudinalpolarization fraction $f_L$.

Rediscovery of $B \to \phi K^{(*)}$ decays and measurement of the  longitudinal polarization fraction $f_L$ in $B \to \phi K^{*}$ decays using  the Summer 2020 Belle II dataset