The warning message "Following permissions are not allowed in the subscription, or service plan: Common PHP settings management" indicates that the ability to manage common PHP settings is restricted for the subscription or service plan associated with the website or hosting account in Plesk.

Common PHP settings include configuration options like memory_limit, max_execution_time, upload_max_filesize, etc.

Here are some steps you can take to address this issue:

1. Contact Your Hosting Provider or Server Administrator:

   • If you're not the server administrator or the person who set up the subscription or service plan, reach out to your hosting provider or server administrator. They will have the necessary permissions to adjust the settings for your subscription or service plan.

2. Upgrade Your Subscription or Service Plan:

   • If you have the required permissions, you can modify the subscription or service plan to include common PHP settings management. This might involve upgrading to a plan that offers more flexibility and control over PHP configurations.

3. Check for Domain-Level Overrides:

   • It's possible that there are domain-level overrides in place that are preventing you from managing common PHP settings at the subscription level. Go to the specific domain settings and check if there are any PHP settings defined at that level.

4. Review Service Plan Permissions:

   • If you're an administrator, review the service plan settings in Plesk. Ensure that the option to manage common PHP settings is enabled in the service plan that the subscription is associated with.

5. Check for Restrictions in Plesk Extensions:

   • Some extensions or additional tools in Plesk might also impose restrictions on PHP settings management. Check if any extensions are installed that could be affecting this.

6. Contact Plesk Support:

   • If the issue persists and you're unable to resolve it, you may want to reach out to Plesk support for further assistance. They can provide specific guidance based on your setup.

Remember to exercise caution when making changes to PHP settings, as incorrect configurations can potentially lead to issues with your website or application. Always back up your data and configurations before making significant changes.