 In 1929, Archbishop Pascual Díaz y Barreto, Archbishop of Mexico, appointed Tritschler to the position of Canon Penitentiary of the Metropolitan Cathedral in Mexico City, officially starting this position on 1 August 1929.After the death of Archbishop Miguel de la Mora y Mora in 1930, Archbishop of San Luis Potosí, the Apostolic Delegate Archbishop Leopoldo Ruiz y Flóres called Tritschler to the Apostolic Delegation to notify him that Pope Pius XI had recommended him to be the new Archbishop of San Luis Potosí.Tritschler did not wish to have the position, and presented five reasons to the Holy See against his own credit, saying