Hope you are doing well. Sorry to hear about your issue with using Acrobat Mobile.
I checked your email address registered with the community, and saw an active subscription for Acrobat Premium.
Please let me know the error you get when trying to use Acrobat. A screenshot of the error would be great.
If the application is unable to identify the subscription, you may try a few steps from below:
1. Logout from Acrobat Reader Mobile;
2. Restart the device;
3. Log in back to the device.
If these do not work, you may try restoring the subscription. Please refer to the link to learn how to restore the subscription: https://adobe.ly/482X1QN
Additionally, please verify that you have downloaded the application from the Galaxy Store, not the Google Play Store.