If you don’t have a valid license for your Jira site or your license has expired, you will see a message to license the app.
To license the product, the Confluence administrator will need to purchase a license for the SharePoint Connector for Jira app in the Atlassian marketplace.
Every Jira site needs to have an active license for the SharePoint Connector for Jira in order for the site to be used in SharePoint
Once activated a licensed product will look like the following.
Be aware that it could take some hours to update the license status if you just activated the license.
After the validation succeeded you will be able to use the app. Users do not need to take action after the license is activated, they can directly use the licensed Jira sites and start to link Jira issues.