"I drink tea every night."
You'd think if Anki knows how to use furigana, Duolingo could figure it out.
I put おちゃを毎晩飲みますbut it was marked wrong. However, the word order I used is not grammatically incorrect, is it?
毎晩 should go in front for the correct stress, otherwise you're stressing the time rather than the tea
毎晩 appears to be the set phrase. I'm sure you could say まいよる or まいゆうべ and be understood, but if you look up "every night" in a dictionary like jisho.org, 毎晩 is what comes up. The way I think of it is like this -- if you were learning English, you might think that "evening" and "dusk" and "twilight" all have similar meanings, the time when the sun is going down but it's not yet full night, and yet nobody says "good dusk," only "good evening." Some phrases are just set.