Enable Microsoft Defender for Endpoint in Intune

[Fhilp]

Hi All

We are looking to migrate to Defender, we currently have all or devices managed in Intune. I understand we need to Enable Microsoft Defender for Endpoint in Intune, my question is

When I enable this setting is there an impact to the existing devices already in Intune? As I understand that no impact is expected until you onboard a device?

I just want to be sure i understanding the workings correctly before i turn on the Intune/Defender Service. 

Thanks

[#2]

The impact of enabling Defender for Endpoint on your existing devices depends on whether they are already enrolled in Intune, and whether they have any conflicting policies or settings. Devices that are not enrolled in Intune will need to be enrolled first. Devices that have conflicting policies or settings may experience issues or errors. Devices that are enrolled and compatible will be able to use Defender for Endpoint features and settings
https://learn.microsoft.com/en-us/mem/intune/protect/mde-security-integration?pivots=mdssc-ga

[#3]

This is not enabling Defender for Endpoint on existing devices, this is soley turning on the "Microsoft Intune connection" in defender.

I believe only when onboarded does a device become active