I have made Ideas and Idea themes tabs visible along with CRE for both for System Admin but when logging in to Community, I don't see it. I see the tabs in SFDC proper but not in Community. Any ideas what I'm missing?
It seems as of today Ideas is not available for any other templates except for Salesforce Tabs + Visualforce. I did try spinning off a new Community with the templates (Customer Service & Customer Account Portal) you mentioned and couldn't see any Idea related component in either Customer Service or Customer Account Portal templates.
Upon further search, I could only see this idea which suggests that Idea components are not available for Napilli template, but seems it's also applicable for all Lightning based templates. I did though find an appexchange product which could possibly be used here (I am by no means affiliated to this product).