The phrase "be obligated to" can be easily replaced with many synonyms, depending on the context of the sentence. For example, one can use phrases like "be obliged to," "be required to," "be compelled to," "be mandated to," "be duty-bound to," "be committed to," "have a responsibility to," or "have an obligation to" to convey the same meaning.
All of these synonyms carry the sense of being morally, legally, or socially expected to do something. Therefore, depending on the situation, it is essential to choose the synonym carefully to best convey the intended meaning. By using the right synonym, one can craft a more precise sentence that conveys the expected action or behavior.