Hi @Toby ,
To be sure, select Endpoint Security intentionally again in the Removal Tool and reboot to see if it improves the situation.
If the problem persists, please contact Microsoft to confirm why windows security center recognizes Endpoint Security as the first antivirus system even though Endpoint Security is not present, as this is also the behavior of windows security center.
If Microsoft's investigation result is that Endpoint Security is the cause, please contact us again by Service Request with the investigation result .
Was my reply helpful?
If this information was helpful in any way or answered your question, will you please select Accept as Solution in my reply and together we can help other members?