Oh this is a tricky one! The easiest way I can write it, phonetically, is mou-ree. it should rime with faux. Roll the r HARD. So that it almost sounds like a d. Mou-dee. If you’re not raised with the specific sounds (like nga), they can be hard to pick up.
Don’t say mao-ree. The mo or mou sound important. That’s where you have to hit it. When I hear someone say mao-ree it makes my skin crawl!
If it helps, my old boss used to think I was saying “moley” when I would say Maori. So it should sound roughly like that, except with a rolled r instead of an l. :)