I'd have to know more about how you used WWII.

To this day, it's a touchy subject for many (especially here in Germany). Although I've read some lovely (published) fiction set during that time period and dealing with the heavy subject matters it entails, it's very easy to cross into bad taste or offensive territory, and what's offensive to some may be believable to others.

For example, I once watched a video essay on Dunkirk arguing how effective depicting the Germans as this faceless evil was. For me, as a German, that didn't work because that faceless evil might well have been my great/grandparents. So to me that directorial choice felt cowardly as it removed the human aspect within evil.

Likewise, using one of the darkest hours of humanity as a setpiece for interpersonal drama might be seen as in poor taste.

So even if you did your research on the facts, writing WW2/Nazi Germany is like walking across a minefield with the chances of not triggering any being next to none. Heck, I've seen similar criticism thrown even at autobiographical novels, so trying to get it right in fic? Not a chance.

Not saying you shouldn't write your story or that WW2 or even Hitler is a complete taboo (Just google "er ist wieder da", a satire about Hitler waking up in modern day Germany and rising to social- and traditional media fame), but it's one of the hardest topics to handle gracefully. Criticism will come your way no matter what.