Excerpt form page 1675 of Max Domarus book, published in 1973, a collection of Hitler's speeches and proclamations.  it indicates that Hitler on March 20, 1941, sent a telegram to Tehran greeting Nowruz spring festival. 

Few months later, Reza Pahlavi was sent to exile and on September 1320, Tehran was occupied by British and Soviets.

Max Domarus, Hitler Reden Und Proklamationen 1932 1945 Vol 1 to 4 , 90 Meg download (Page 1675): https://archive.org/details/HitlerRedenUndProklamationen19321945