The generation and robustness of two‐magnon non‐locality and coherence dynamics induced by an open microwave field cavity are investigated in this work. The studied system consists of a two‐sublattice ferrimagnet coupled to a microwave field within an open cavity through its magnetic field component. The robustness of the two‐magnons non‐locality dynamics is analyzed using various non‐locality and coherence measures (namely, uncertainty‐induced non‐locality [UIN], maximal Bell function, and log‐negativity entanglement [L‐NE]) in the presence of the spontaneous emission and the electromagnetic‐wave dissipation. It is shown that photon‐magnon couplings, two‐magnon couplings, and dissipation all have an impact on the dynamical aspect of two‐magnon non‐locality and coherence. This work reveals that the two‐magnon non‐locality and coherence can be generated. For an initial maximal correlated two‐magnon state, the initial UIN non‐locality is shown to be more resilient than the maximum Bell function and log‐negativity. The amplitudes of the two‐magnon non‐locality quantifiers decline as a result of the two‐magnon coupling. The Bell non‐locality and L‐NE are reduced via spontaneous emission and dissipation, but the two‐magnon UIN‐coherence is preserved. These findings contribute to a better understanding of such dynamics and may shed light on measurement estimation in open quantum systems.