We installed adobe acrobat DC on Terminal server, we logged in and inserted the serial number. Now it says every 30 days that the version is a trial?

We installed adobe acrobat DC on Terminal server, we logged in and inserted the serial number. Now it says every 30 days that the version is a trial?

We have a Windows 2012 r2 Remote desktop server were we installed Adobe Acrobat DC.

After a few months it began to ask that the version we installed was a trial and that it will expire in 30 days.

Everytime I need to fill in the license again, even if it is logged on as the correct user (adobe acrobat) which owns the license.

Any ideas?