What is a CNCC?
Certificates of No Criminal Conviction (CNCC) is issued by the Hong Kong Police Force which is related to visa applications, such as visit, student or resident visas, as well as children adoption. Applications for any other purposes will be rejected.
Reference:
Certificate of No Criminal Conviction (CNCC), Hong Kong Police Force
When do you need a CNCC?
If a CNCC is required, Immigration, Refugees and Citizenship Canada (IRCC) will request it by sending you a letter after you have submitted your application for permanent residence in Canada.
When applying for a police certificate from the Hong Kong Police Force, it's essential to include or submit the letter received from IRCC. The police certificate will be sent directly to the IRCC office at the Consulate General of Canada by the Hong Kong Police Force, and there is no need for you to send it separately.
Reference:
How to get a police certificate – Hong Kong Special Administrative Region, IRCC
How to get a full set fingerprint in Canada when applying CNCC?
Fingerprinting Security Canada is a RCMP accredited third-party fingerprint service provider. You can make appointments through our website: https://www.fingerprintingsecuritycanada.com or call us at 905-479-7788.
Remember to bring two authorized and valid pieces of identification, such as a passport and driver’s license and the request letter form IRCC.
Your plain impression of both left and right hand four fingers and left and right thumbs will be printed on a RCMP Fingerprint Form - C216C.
Your full name, our fingerprint technician's name and rank, our company's information and official stamp will be printed on the fingerprint form.
Supplementary proof will also be provided.
Source:
Notes to Applicants outside HK, Hong Kong Police Force