Hope you are doing well and thanks for reaching out. We are sorry for the trouble you are experiencing.
I have checked the Adobe account linked with the Adobe ID you are using on this community and unable to find any active/paid plan. If you have used a different email for the purchase, please log out of the application and re-login with the correct Adobe ID (Email) and see if that works.
Thanks for sharing the details in the screenshots. I was able to locate the plan.
As described in your initial post that you were not able to use it, and a pop-up always appears asking to subscribe again, Please try to log out of the application and reboot the device once and re-login with the same Adobe ID and see if that works. If it still doesn't work, please open the Acrobat Reader mobile app, go to Profile > Subscriptions > Restore Purchases and check