Romania was at war whit Germany from end of august 1944, in April 1945 probably more than 200.000 Romanians were fighting against Germans in Czechoslovakia (1st and 4th Army, containing 17 divisions and different other troops). No diplomatic relation between Romania and Germany was possible at the moment. The so called „Iron Guard regime” was the creation of Germany, but had no authority in Romania, in April ’45 or before.
The Iron Guard was part of the regime imposed by German pressure autumn of 1940, but they were expelled after an unsuccessful rebellion (aimed at gaining total power over Romania) in February 1941. After that, some member of Iron Guard has escaped to Germany, where they were interned (practically prisoners of the Third Reich), and used to create the appearance of a filo-German regime after 23 August 1944, when Romania has changed side, and Hitler was unable to find support inside Romania for forming a new progermanr regime.The „Iron Guard regime” in Germany cannot be considered a foreign country diplomatic representation (and not even a government in exile).