It depends. Word order can be a bit tricky in Norwegian. Ikke is normally placed after the predicate(verb), however, in subordinate clauses it is placed before the predicate, e.g.: 1) Vi har ikke sjokolade(we don't have chocolate) 2) Det er synd at vi ikke har sjokolade(it's a pity that we don't have chocolate).
I don't think Duolingo cares too much about punctuation but still, it's good practice to pay attention to capitalisation and punctuation as well as spelling the words properly to minimise the possibility of Duolingo marking your answers as wrong even though it can recognise typos which aren't grammatical mistakes as well.
If Duolingo repeatedly marks your answer as incorrect, report it as a bug.
You're supposed to say it in Norwegian, the app should not care about your English pronunciation because it assumes that you already know how to pronounce words because it's the language you're learning Norwegian from.
If you usually don't have difficulties with using your mic and you experienced a problem only with this sentence, then it's probably a bug. Otherwise, try following this algorithm.
If you're using Chrome, you need to click the lock icon left of "https://duolingo.com". From the drop-down menu, choose Site Settings. Under Permissions/Microphone, select Allow from the drop-down menu. Reload the page, check that your microphone (headset mic or one integrated with headphones) is connected, that you have all the necessary drivers installed (if needed) and make sure it's enabled in your operating system sound settings so you don't end up speaking into a void. You need to have the Speaker enabled in Duolingo settings as well. Then, you just have to wait for a speaking exercise to appear.
If this doesn't solve your problem, create a thread in the Troubleshooting Discussions.