Irrespective of whether there are Qur'anic Ayahs in that amulet or not, when Prophet Muhammad (pbuh) said it, he meant it. (I don't have anything extra other than those Hadith which " mkhan3189" provided in his answer) Why is it Haram?

By carrying your taweez with you, you’re inviting Allah’s protection into your life. And as long as you believe in the power of the taweez, it can help keep you safe from harm in times of war or conflict. If he refuses any of these steps, I would conclude that it's probably a shirk taweez. Or if you open it and find strange symbols and numbers (probably jinn language), it's a shirk taweez. There are many benefits of reciting ‘Al-Mu’awwidhatan’ i.e, Qur'an 113 (Al-falaq) and Qur'an 114 (An-naas). If you see reason of revelation of these two chapters of Qur'an you will find out they are revealed for this purpose, hence very useful.Narrated ‘Abdullaah ibn Mas’ood (radiyAllaahu ‘anhu) who said that the Messenger of Allah said: Verily incantations [ar-Ruqaa], amulets [at-Tamaa'im] and bewitchment [at-Tiwalah 1 ] are shirk" - Narrated by Aboo Daawud, no. 3883 and made Hasan by ash-Shaykh Muqbil in al-Jaami’ as-Saheeh: 4/499, and al-Haakim: 4/217 and authenticated by ash-Shaykh al-Albaanee Reciting Al-Mu’awwidhatan

It’s important to keep in mind that everyone has their own opinion on this topic and there is no “right” answer. Ultimately, it’s up to you to decide if using a taweez for protection is morally acceptable or not. You should also consider the religious implications, since some view it as against the teachings of Islam.If you want to stay protected by the creator just remember him, and ask him to protect you. Simple. I can say, it need not be even in Arabic. Believing that God will prioritize you with a Tawiz in Arabic letters of verses in contrast to the one who simply called on God, is... I don't think is a good idea. There are different types of taweez for protection. You can get a taweez for protection from a Muslim scholar, or you can make your own taweez for protection. Whether your illness has magic or not is something to consider carefully. Magic is itself shirk, and an affliction of jinns. Note the ayah above; it is absolutely haram to combat magic with magic. You cannot hire magicians to beat up other magicians, or otherwise remove any magic-based affliction, because this is shirk. You must use Qur'anic ruqiyyah.

Taweez can be especially helpful in times of war, as they can offer extra protection to those who are fighting. Additionally, many people find that taweez help to improve their overall wellbeing and protect them from harm.

Why is it Haram?

If you’re thinking about using a taweez for protection, it’s important to know how to prepare one properly. You can either make your own taweez or find a qualified practitioner who can help you create one specifically for your needs. But this isn’t just superstition: many people believe that the power of faith and positive energy helps to fight fear and act as a shield against danger. It’s also said that when a group of people uses a similar prayer or taweez in unity, the energy is multiplied and the protection is stronger. So if you’re planning to go into any situation where there is danger, it might be worth considering having your own taweez for protection.