Such situation can occur due to some error on the Veeam License Update Server side. The currently installed license key does not need to be updated. A new license key is successfully generated, downloaded and installed on the backup server or Veeam Backup Enterprise Manager server.
Manual license update can complete with the following results: You can double-click the License key auto-update job to examine session details for the license update operation. Statistics on the manual license update process is available under the System node in the History view. In the License Information window, click Update Now.If you have obtained a license for a greater number of instances, counters in the new license also display the new number of license instances.
The new license key differs from the previously installed license key in the license expiration date or support expiration date. When you update the license manually, Veeam Backup & Replication connects to the Veeam License Update Server, downloads a new license from it (if the license is available) and installs it on the backup server. You can update the license manually on demand.