The Activation Code settings in Jamf Pro allow you to update the activation code for your license. You can also change the organization name associated with the license and view licensing information.
Current activation codes are located in the Jamf Account portal under your Jamf Pro Licenses.
Note:
If Jamf Pro displays "Device count exceeded" in Notifications, verify your activation code in Jamf Pro matches the code in Jamf Account. You can also compare the number of your enrolled devices with your total licenses purchased.
For assistance, log in to Jamf Account with your Jamf ID and click Get Help 
in the top-right corner of the page to contact your Account team.