Hi

If registration has started then It is not possible to show your roll number as invalid if you are filling your details rights.

Check your details once again

If not, then you ask for help and support or contact their helpline number. They will help you in rechecking your entries

Don't worry

As per the official website https://hp.online-counselling.co.in/admissions/onboardingHomePage dated November 4th, it says that the Registration process will begin shortly. The registration process hasn't begun atleast as of now. Once the process begins, you need to use the New Registration link https://hp.online-counselling.co.in/admissions/onboardingRegistrationInstruction . Click on I understand and proceed further. For more information, please read our article: https://medicine.careers360.com/articles/hp-mbbs-counselling