Yes, hijab requirements are mandatory for practicing Muslims.
The obligation of what we call hijab (the act of veiling) was commanded by God in the Qur’an, and understood and practiced by the companions of Prophet Muhammad ﷺ. A scholarly consensus affirms the wearing of a hijab as a religious obligation.
This does not mean that all Muslim women must dress the same. Hijab practices can look very different across cultures, and this cultural variation is both expected and accepted.