The Archbishop-Elector of Mainz, Archchancellor of the Empire, eventually gave his support, not least because it was known that Karl Theodor and Joseph II also mulled over the possible secularization of the Archbishopric of Salzburg, inconveniently wedged between Bavaria and Austria.
Mainzi peapiiskop-kuurvürst, keisririigi ülemkantsler, andis lõpuks oma toetuse, mitte vaid seepärast, et oli teada, et Karl Theodor ja Joseph II rääkisid ka Salzburgi peapiiskopkonna võimalikust ilmalikustamisest, mis kiilus ebamugavalt Baieri ja Austria vahele.