It’s actually not necessary to know the specific cookie policy and site ids as this data is inserted by default into the iubenda Cookie Solution.
If, however, for some reason you’d like to find your site and policy ids, you can find within the embed code here:
Dashboard > [Your website] > Cookie Solution > Embed
Look for “siteId” and “cookiePolicyId” within the code snippet.
For further information on the Cookie Solution, consult this introductory guide.