Youth (1977)

After her senses are surgically restored, a formerly deaf mute teenager enlists in the army and is assigned to communications work. But her inexperience with even such simple tasks as answering a telephone lead her supervisor to conclude she is incompetent, and try to have her reassigned. However, a courageous action by another soldier leads him to reevaluate his judgment.

Unfortunately the movie Youth is not yet available on HBO Max.