Yes, an IELTS score can be rejected for a student permit application in Canada if it does not meet the minimum language proficiency requirements set by the Canadian immigration authorities. The score might also be rejected if it is not from an accepted testing center or if it is deemed fraudulent or not authentic. It's crucial to ensure that the IELTS score is valid and meets the specific requirements of the program you are applying to. Adhering to the official guidelines and using accurate and valid test results will help prevent rejection of the IELTS score for your application.