We hypothesize that the formation of the passivating SEI requires time to develop, approximately one hour under the reported conditions, and selectively permits the passage of Mg +2 ions, N2, H2, NH3, and H+ . In metal-mediated systems, the oxidation of DMF at the electrode likely leads to the formation of a complex SEI composed of various organic and inorganic decomposition products. This SEI layer is critical for protecting the electrode surface and ensuring long-term system performance by being selectively permeable to magnesium ions while minimizing further reduction reactions. The formation of the SEI may involve mechanisms such as oxidation of reactions of organic solvents, similar to those observed in related systems like tetrahydrofuran (THF) , which undergo analogous degradation processes. While the SEI is beneficial for stabilizing the system, dissolved byproducts from the reaction between Mg and the solvent can negatively impact overall performance and ammonia selectivity. We hypothesize that once a stable SEI is formed, it enhances voltage stability by effectively suppressing further reduction of DMF at the electrode, thereby maintaining system integrity over time. Switching times also impact mass transport. It has been experimentally observed that during resting time, the open circuit potential should be maintained close to ~-0.1V to -0.5V depending on the current density. This condition is crucial for maintaining a stable and porous SEI, which facilitates the efficient mass transport of N₂ to the fresh Mg layer, enabling its nitridation. Without a stable and permeable SEI, nitrogen would be unable to penetrate and react with the deposited Mg, compromising the overall reaction process. Deviations from ~-0.1V to -0.5V favor H2 formation through Mg protolysis. Thus, optimizing the resting time is crucial. Stirring speed also affects Mg3N2 and Mg protolysis and may vary based on the size and type of stirrer employed . If the open circuit potential deviates significantly -0.5V, adjustments can be made to restore it. Lowering the resting time, working time, and stirring speed can bring the potential back to -0.1 to -0.5V if it drops below this value. Conversely, increasing the resting time, reducing the working time, and enhancing the stirring speed can restore the potential to -0.1 to -0.5V if it rises above this threshold. Based on our observations, we found that 1 minute of working time and 1 up to 6 minutes of resting time are optimal for stabilizing the SEI depending on the total current density.