Hi,
I assume you used the Creative Cloud Packager to build your package?
For an imaging workflow you might find the following useful
https://helpx.adobe.com/enterprise/kb/cce-deploy-imaged-workstation.html
"If users receive a sign-in or serial number prompt when launching the software, for serial number and device licensing, the license was connected before creating the image. You can either use our Licensing Toolkit to relicense the machines or correct the base image. See the Creative Cloud Packager help to Create a License file to relicense the machines."