Hello! I purchased a patreon subscription for 10 CAD, but I cannot access the content on itchio using the special link that is provided with the subscription. How to solve this problem?

It’s possible the account that has the Patreon integration has not configured the currency of their project. They will need to go into their Patreon settings on itch.io and select a currency. Since you did not reveal what page it is, could you contact them about it?