Objectives have to be specific and interpersonal. "She wants respect" is a condition and cannot be won in a scene. "She wants him to admit he read the email" is an objective: it can be achieved, refused, or deflected, and each of those produces a different next line. Vague objectives are the leading cause of scenes where actors have nothing to play.
The related pieces are the obstacle, which is what stands in the way, and the tactic, which is what the character switches to when the first approach fails. A scene in which the character never changes tactic is a scene with one beat, however long it runs.
The diagnostic is quick and works on any draft: for each character in the scene, write what they want from the other, in a sentence beginning with a verb. If you cannot for one of them, that character is furniture and the scene will feel one-sided even if you cannot say why.
What is a scene objective?
What a character is trying to get from another character within the scene, specific enough that they could succeed or fail at it before the scene ends.
Why do my scenes feel like nothing is happening?
Usually because one or more characters have no objective, or because nobody changes tactic. Write, for each character, what they want from the other in a sentence starting with a verb. A character you cannot write one for is furniture.