Cannot upgrade an additional license: An error occurred while validating your entries. Please correct the data in the highlighted fields below

Symptoms

• Cannot upgrade an additional license to higher/lower amount of resources. For example, Acronis extension license.

• Cannot add an additional license into a Plesk license. 

• The following error message appears in the Plesk Online Store:

  PLESK_ERROR: Input error
  An error occurred while validating your entries. Please correct the data in the highlighted fields below. Can not be applied to the specified license number

Cause

• The Plesk license already has additional key: it is not possible to order second additional key for the same extension.
• The Plesk license is "Plesk 10/11 and later" (not edition-based) which is not compatible with the required additional extension license.

Resolution

Note: A Plesk Partner can perform this operation from KA Partner Central

1. If you have Plesk edition-based license (Web Admin, Pro or Host edition), please visit this article.

2. If you have Plesk 10/11 and later license, replace it the following way:

• Cancel the current Plesk license (Plesk 10/11 and later)
• Purchase a new Plesk edition license
• Add extension license from Plesk Extensions Store 

In case of any additional questions contact licensing team via chat in Plesk 360 or through the form Plesk licensing and purchase support.