Let me explain. Taraweeh is a voluntary night prayer performed during Ramadan, and the core of it is simply praying in pairs of rak'ahs with the intention of drawing closer to Allah. The supplications that are recited between the sets of four rak'ahs are a beautiful tradition that many Muslims observe, but they fall under the category of recommended acts (sunnah), not obligations. The prayer itself does not depend on them.
The dua you are referring to is a well-known one recited after every four rak'ahs. It begins by glorifying Allah as the Possessor of the hidden and manifest dominion, the Possessor of Might, Greatness, and Majesty, the Living One who neither sleeps nor dies — and then it asks Allah for refuge from the Hellfire:
> "O Allah, grant us refuge from the Hellfire. O Granter of refuge, O Granter of refuge, O Granter of refuge."
> [Dua: After every four rak'ahs of Taraweeh — dua_130]
There is also a dua specifically recited after completing the Taraweeh prayer, in which the worshipper asks Allah for Paradise and seeks refuge from the Fire:
> "O Allah, we ask You for Paradise and seek refuge in You from the Fire. O Creator of Paradise and Fire, by Your mercy... O Allah, save us from the Fire!"
> [Dua: After completing Taraweeh prayer — dua_131]
So to summarize: these duas are a cherished sunnah that many communities practice, and they carry great spiritual value because they turn the heart toward Allah and toward the Hereafter. But they are not a condition for the validity of Taraweeh. The Prophet ﷺ encouraged voluntary prayers and supplications, and the general principle is that extra remembrance and dua during the night prayer bring you closer to Allah without being a burden or an obligation.
A practical tip: If you want to follow this beautiful tradition, you can find these duas in the Invocations (Duas) section of your Al Muslim Plus app, where you can read them, listen to them, and memorize them at your own pace. And remember — the most important thing is that you pray your Taraweeh with sincerity, whether or not you add the duas between the sets.