you can use premium features but do not have access to the adobe creative cloud

This seems you have purchased the subscrition via Apple Store/Google Play Store and hence you can sync only across mobile devices. See the following article

https://helpx.adobe.com/uk/lightroom-cc/kb/manage-subscription-ios.html

If you still have questions please contact support.
Login to your account and navigate to the URL below. Make sure that the browser has cookies enabled, and all script blockers are disabled.
https://helpx.adobe.com/contact.html?rghtup=autoOpen
Type AGENT to avoid bots and talk to a human.
Also, be mindful of answering anyone who sends you a private message. See the following for more information about scammers
https://tinyurl.com/y7cfrr7y
-Manan