– Changed Login Credentials: You can’t log in with your usual password. – Email from Instagram About Changes: You receive an email from security@mail.instagram.com (or similar official address) notifying you that your email address, password, or phone number has been changed – and you didn’t initiate it. – Unauthorized Activity: You see new posts, stories, DMs, or follow requests that you didn’t make. – Profile Changes: Your profile picture, bio, or username has been altered.