Error: Malware Protection service did not load successfully on Endpoint Protection 16.0 for Mac

Products

• Endpoint Security

Issue/Introduction

After installing or upgrading to Symantec Endpoint Protection (SEP) 16.0 on macOS, the client user interface displays a warning: "Malware Protection [Warning] The Malware Protection service did not load successfully."

Environment

Symantec Endpoint Protection 16.0 (Mac)
macOS 15.x (Sequoia) or newer

Resolution

Validate and perform the below steps:

1. Ensure System extension is enabled. Review Privacy & Security for any notices to allow the system extension.
2. Check the System Settings > Full Disk Access and verify com.broadcom.sea.SeaCoreService.systemextension and com.symantec.Uninstaller.Tool.Helper are both selected to Allow.
3. Check System Settings > General > Login Items & Extensions -> it should show the Endpoint Security Agent.app as allowed under "App Background Activity"  and under "Extensions" > Endpoint Security Agent, click on the "i" button and ensure the Security Extension is enabled\allowed.
4. Reboot the system