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Hi, Welcome to Just Answer. I'm Chris, a small animal Vet based in the UK. I am reviewing your question and will get back to you as soon as possible
Does the area of baldness looks crusty or scaly? If so this could be a mite infection. It can be treated with Xeno 50 mini applied every 2 weeks for 3 treatments. https://www.animeddirect.co.uk/xeno-50.html?gclid=CjwKCAjw36DpBRAYEiwAmVVDMJ0utfeTe22gWrfk_KXmKhNJzbXRoj5WWFWTi_6kiT9eYWdq60e5ABoC4UQQAvD_BwE
I will also attach a care sheet to have a look at. It is primarily for budgies but many things such as diet and enclosure apply to Canaries as well. Let me know when you have received it and if you have any further questions.