There are several synonyms for the phrase "let into," each with its own slight variation in meaning. Some alternatives include "allow entry," "admit," "grant access," "give admittance," "permitted," and "provide entrance." These synonyms can be used in a variety of contexts, such as allowing someone into a building or venue, granting access to a protected digital space, or even giving someone permission to join a group or activity. Each variation may convey a slightly different tone depending on the situation, but all ultimately refer to the act of granting someone access that was previously restricted.