It's a largue pronunciation in this case Nyū (ニュー), but if It haven't this one ー in this case is Nyu (ニュ).
It extends the sound of the last vowel. In this case, it extends the 'u' sound.
Thank you all for your help! There is much i feel that duolingo lacks in explination that you have all been able to explain and im very greatful! In this instance, figuring out what the "ichi" symbol at the end is and why it doesnt make that sound and is instead just an extender. Thank you!