Use a reseller or administrator role permitted to manage the subscription and plan. Record current resources, permissions, add-ons and custom settings. Identify whether the business intent is to change one customer, update a shared plan or bring a customized subscription back into alignment.

1. Open the subscription and inspect its associated plan, add-ons and synchronization status.
2. Compare the relevant current settings with the plan. A locked subscription is excluded from ordinary plan synchronization; an unsynced state can also mean the server cannot provide a planned feature.
3. If the difference is intentional, retain the customization and document it, or model the recurring difference as an appropriate plan or add-on.
4. If the customer should inherit the plan again, review the intended changes before using the available unlock-and-sync action. Check reduced limits against actual use.
5. After synchronization, inspect the detailed result and test the affected functions. Keep a record of any setting that still differs because customer-managed permissions or server availability affect synchronization.

Confirm the subscription has the intended limits and tools, not merely a clean status icon. Check PHP configuration, backup access or DNS permissions when those were part of the change. Verify unrelated subscriptions were not altered accidentally.

For a synchronization failure, read which resource or feature could not be provisioned and correct that specific mismatch. Do not repeatedly force all subscriptions to match a plan. Some additional directives can be affected by synchronization even when their earlier customization did not visibly lock the subscription, so preserve critical values before proceeding.

• Adjusting PHP limits for one Plesk domain
• Creating a limited additional Plesk user
• Scheduling Plesk subscription backups and retention
• Understanding nginx proxy mode and static files in Plesk

• Plesk: Syncing Subscriptions And Plans
• Plesk: 12377651439767 Additional PHP Directives For Domain Disappeared Or Got Changed After Synchronization With The Service Plan