As per the issue description mentioned above, you are facing issue with Acrobat's license on the machine, is that correct?
Please check if you are trying to enhance scans in Acrobat DC not Acrobat Reader DC. You can check the same using the steps given here: Identify the product and its version for Acrobat and Reader DC Also, try to sign out and sign back in and check if that helps.
You may also visit the following forum thread discussing the similar issue:
Let us know if you need any help.
Which version of Acrobat Pro?
Is this a new install?
Or was it working and suddenly stopped working with the current install?