"Be required to" means being obligated or compelled to do something. There are many words that can be used as synonyms for "be required to." These include "must," "have to," "need to," "ought to," "should," "be obliged to," "be compelled to," "be mandated to," "be forced to," "be duty-bound to." These words can be used interchangeably in context, with slight variations in nuance depending on the intent and tone of the writer or speaker. Regardless of the choice of words, the underlying message is that there is an obligation or expectation to perform a certain action or behavior.