He then was stationed in the political department of the Foreign Office and at the German Embassy in Saint Petersburg.

[5] After joining the German Democratic Party, von Prittwitz unsuccessfully ran for a seat in the first Reichstag of the Weimar Republic.

Upon his return to Germany (aboard the Europa),[8] he met with Hitler[9] before retiring from the diplomatic service on 18 July 1933.

[4] As his beliefs were in contrast to the new rulers in Germany, the National Socialists, Prittwitz hoped that other ambassadors would join in their resignations, but remained the only one.

In 1948, together with Waldemar von Knoeringen and Thomas Dehler, he founded the Society for Foreign Studies (German: Gesellschaft für Außenpolitik), of which he served as the first chairman.

[4] On 21 December 1920 he married Countess Marie Luise von Strachwitz und Groß-Zauche (1892–1986) in Berlin.