...
When you migrate to a Data Center host product, your Server app license(s) will no longer be valid on a Data Center instance. You will be required to move to a Data Center app license(s) in this case.
How to update my server license key?
When you purchase a new server license or renew/upgrade an existing server license, a new license key will be added to the Billing & Technical Contact's My.Atlassian account. Once a Billing or Technical Contact has copied the license key from their My.Atlassian account, follow the steps below to apply your new key to your server environment:
Log in to Jira as a System Administrator
Click the Settings gear icon > Applications
Click Versions & Licenses
Locate the license you want to update, and click on the pencil icon to edit the license. Replace the existing license key with your new license key.
Click Update License
🔎 For more information, please check Atlassian Purchasing & Licensing. You can find actual app pricing on our Marketplace page.