Unable to synchronize subscriptions with Service Plan: hard disk quota is not supported due to configuration of server file system

• Unable to synchronize subscriptions with the Service Plan:

  CONFIG_TEXT: The sync of service plan Basic was completed. Some subscriptions were not synced with the plan
  Unable to apply plan changes to domain example.com

• The error in /var/log/plesk/panel.log:

  CONFIG_TEXT: Unable to apply plan changes to domain example.com. Error: The plan was not applied because of problems with the following functionality: hard disk quota is not supported due to configuration of server file system

• 'Hard quota on disk space' option is missing at Plesk > Domains > example.com > Web Hosting Access 
• 'Hard disk quota assignment' parameter at Service Plans > example_plan > Permissions is enabled.

Cause

Disabled 'Hosting settings management' option at Service Plans > service_plan name > Permissions tab.

Resolution

1. Log into Plesk
2. Enable 'Hosting settings management' option at Service Plans > service_plan name > Permissions
3. Enable 'Hard disk quota assignment' option at Service Plans > service_plan name > Permissions > Show more available permissions

Additional Information

Unable to setup the Hard Disk quota for a domain: field is greyed-out, hard disk quota is not supported due to configuration of server file system