Yes, it was. I have read that Hitler worked around this by having himself named as an attache to a German foreign office so he could claim title to German citizenship.
Thanks for the correction. That Hitler was a sneaky little bastard, wasnt’ he? I have not studied Hilter, just saw a few programs on his twisted life. So adding your info to the list of Obama-Hilter similarities, they both violated the rules to become Furher. As G.Gordon Liddy says “Oh My!”.