That's all handled via the Adobe Creative Cloud Desktop application. Does that show you as being signed in?
Assuming you are signed in, it's probably worth signing out and then back in. Then use your Adobe account icon in the upper right corner to choose "Adobe account". This will take you to your Adobe account at account.adobe.com where you can click "Plan" to view your current plan.
You'll also notice that if you click on your Adobe account icon in the upper right corner of Creative Cloud Desktop that there's a Contact Us option. If a sign-out/sign-in doesn't resolve this issue or something about your plan does not look right, it's worth taking the time to start a chat. When you type your message, try something like "single app subscription not active" and that should get you transferred from the virtual assistant to a real person who can check this for you.