Isospin-1/2 charmed axial-vector D∗π − D∗η − \( {D}_s^{\ast}\overline{K} \) scattering amplitudes are computed, along with interactions in several other I = 1/2 JP channels. Using lattice QCD, we work at a light-quark mass corresponding to mπ ≈ 391 MeV, where the lowest three-hadron threshold (Dππ) lies high enough to enable a rigorous treatment of this system considering only two-hadron scattering channels. At this light-quark mass, an axial-vector D1 bound state is observed just below D∗π threshold, that is strongly coupled to D∗π in a relative S-wave and influences a wide energy region up to the D∗η threshold. An axial-vector \( {D}_1^{\prime } \) resonance is observed in the elastic D∗π energy-region, which is coupled more strongly to D-wave D∗π. A single narrow tensor state is seen in JP = 2+ coupled to both Dπ and D∗π. In the region where D∗η and \( {D}_s^{\ast}\overline{K} \) are kinematically open, the available energy levels indicate significant S-wave interactions. Upon searching this region for poles, several possibilities exist with large uncertainties. One additional state consistently arises, predominantly coupled to the S-wave D∗π − D∗η − \( {D}_s^{\ast}\overline{K} \) amplitudes around the upper energy limit of this analysis.
