somebody's face doesn't fit

Từ điển Oxford Advanced Learner 8th

sb's face doesn't fit f6 idiom
used to say that sb will not get a particular job or position because they do not have the appearance, personality, etc. that the employer wants, even when this should not be important
•It doesn't matter how well qualified you are, if your face doesn't fit, you don't stand a chance.
Main entry: ↑face_idiom