Imunify extension for Plesk does not detect an installed Imunify360 license: No valid license was found for this Imunify360 installation

Symptoms

• After installing a Imunify360 license, Imunify extension is not activated with one of these messages:

  PLESK_INFO: License Action Required
  No valid license was found for this Imunify360 installation. Please renew your license to continue using all features, or proceed with the downgrade to ImunifyAV/AV+ product.

  PLESK_INFO: The license is not installed.
  To buy a license, click on this link: https://go.plesk.com/buy-plesk-ext/imunify360?kn=PLSK.01234567.0003&r=https%3A%2F%2Fserver.example.com%3A8443%2Fplesk%2Flicense%2F

• After reinstalling the license using the steps below, the message about license still appears in the extension:
  1. In Plesk, go to Tools & Settings > License Management > Additional License Management.
  2. Select the Imunify360 license and and remove it.
  3. Switch to Plesk License Key tab and click Retrieve Keys.

Cause

License is incorrectly detected by Imunify extension.

Resolution

Contact CloudLinux Support for further troubleshooting.