MAKE YOUR HELP/SUPPORT NON-INSANE ****!
I've spent over an hour trying to figure out how to activate Acrobat DC Pro with a license number. Help is useless... the instructions only say how to activate using a serial number. I tried doing a chat session to support... somebody answered, then immediately closed the session. And then it too me 15 minutes going in circles to find a phone number to call... put on hold fo 5 minutes, then transferred twice. Just to activiate a license. That's ridiculous.
Apologies for the trouble you had. I hope the issue is resolved for you now. We will try to improve our support service.