On Upwork, neither party is necessarily required to leave feedback. Lack of feedback does not impact your Job Success Score, either. While we know it’s ideal for all your clients to leave feedback, neither you nor we can require them to do so. Your best bet is to politely ask for honest feedback. Avoid phrases like “I am expecting good feedback” or “I need feedback from you.” Focus on being positive and professional.
You can find more information in this help article.