Fix "Antivirus cannot work system extension permission not allowed" error

You may get this message on your Mac:

Why did this happen?

You may have closed the instruction page for setting up System Extension.

How do I fix this?

Allow Trend Micro Extension:

1. Click Cancel or Try Again and continue to allow System Guidance.
2. Click Continue in the Permission Overview page.
3. Click Open System Preferences.

   

4. Unlock the page.

   

5. Click the Allow button.

   

6. Select all Placeholder Developer, and then click OK.

   

7. Click Allow when you see this popup below.

   

8. You will find that the page has changed, click the Continue button.
9. Click the Open System Preferences button.
10. Unlock the page if it is locked.
11. Select Full Disk Access, and then tick Trend Micro Antivirus and Trend Micro Antivirus Extension.

    Make sure to select both Trend Micro Antivirus and Trend Micro Antivirus Extension.

    

12. Click Verify to validate the necessary permissions.