Adobe Acrobat DC 2015 License issue
I have a volume license for Acrobat DC 2015 that I have been using for the last 8 years. We have it installed on approximately 40 computers and have a 50 license pack. Adobe has verified that my serial number is active and valid, however we receieve the below pop up each time Acrobat is opened.

If I continue it fails, however I can close the pop up and continue working. It comes back every few minutes and with each document opened.
