Kammala jumla mai zuwa: An canza shi don zama Akbishop na Paris a ranar 13 ga Disamba, 1920. Ya shiga cikin
1922 taron papal wanda ya zabi Paparoma Pius XI. Dubois ya taka rawar sasantawa a alaƙar da ke tsakanin Faransa da Faransa. Ya kafa wani ordinariate (a karkashin bishop mai taimakawa Emmanuel Chaptal, zuriyar Jean-Antoine Chaptal) don daidaitawa, ta haka ne ya kara ikon kula da Faransanci na aikin baƙon harshe Katolika a Paris. Ya kasance Archbishop na Paris har zuwa mutuwarsa a 1929. An binne shi a cikin Notre-Dame de Paris.