Plesk license key or Additional license key 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 fix the issue.
The following article does not fix the issue: License can not be installed: Request cannot be serviced from the specified IP.
Contact Licensing and Purchase support.