Plesk license cannot be updated. The following error is shown in Plesk:
PLESK_ERROR: Unable to update PLSK.XXXXX.001: an error occurred while processing your key. You can try to retrieve the key manually in Plesk (Tools & Settings > License Management) or let Plesk try to update it in the next 24 hours. If you do not want to receive this notification any more, remove this key from Plesk.
Manual retrieve of license key does not help to fix the issue.
Contact Licensing and Purchase support.