If you're seeing the message "Cannot reach license server" please make sure you have the following domains whitelisted in any content filters:

squid-license-2018.firebaseio.com
us-central1-squid-license-2018.cloudfunctions.net

After the domains have been whitelisted, restart the device displaying the error message to initiate another license check.

For any other issues, please contact support. For setup instructions, please see Deploying the Squid EDU Bulk License app to managed Chromebooks.