Hitler demanded the unification of Austria with Germany and the German-speaking border regions of Czechoslovakia, but he never made Mussolini return the South Tyrol (German-speaking areas given to Italy after WWI which had been part of Austria until then).
Yes, I know! At the time the Italian army was viewed as superior to the German Army. (Yes hard to believe but it was believed back then!). There was no way Hitler could intimidate Mussolini into giving up south Tyrol. Italy spent a lot of lives in WWI in Alpine fighting. South Tyrol was its reward for doing so.