This study aims to elucidate the Moderate or Intense Low oxygen Dilution (MILD) combustion of ammonia/hydrogen in opposed jets configuration. The opposed jet geometry is adopted to simplify the analysis; the jet of premixed reactants is preheated and stabilized by an opposed jet of cold nitrogen. The oxygen volume varies from 3% to 21%, hydrogen volume ranges from 5% to 60%, and the preheating temperature increases from 900 K to 1600 K. The combustion kinetics is described by the CRECK detailed mechanism of ammonia pyrolysis and oxidation (Ver. 2302 of Feb. 2023), comprising 203 elementary reactions linking 31 species. It was found that under conditions considered, the MILD combustion regime is reached for all cases. MILD combustion regime can be easily maintained with hydrogen addition. Also, increasing hydrogen and injection temperature enhances all parameters (mole fractions of H2O, OH, and NO), extends the reaction zone, and gives a uniform distribution of properties characterizing the MILD regime. Important NO quantities are produced in all cases; the worst is when oxygen increases to 21%. It is important to reconsider this study in depth and to optimize NO production.