@Huxley Haroldo dos Santos, Thanks for posting in Q&A. From your description, I know you want to move from configuration manager to Intune. And the SCCM will be discontinued.
I notice co-management is configured. After that, we can set the MDM Authority to Intune and switch all workloads from SCCM to Intune. You can try the steps in your link. After the workloads are switched, we can go to one device side to confirm if the workloads are all switched to Intune as below:
And then we can uninstall the Configuration Manager client. Devices will be ready to apply the app or policy from Intune. Here is a link with more details for your reference:
For new device, as SCCM is not used any more, then we can consider other enrollment method to enroll into Intune. You can choose one according to your situation. Here are some enrollment methods for your reference:
BYOD: Enroll their personally owned devices via company portal.
DEM: It is a special service account have permissions that let authorized users enroll and manage multiple corporate-owned devices. These types of devices are good for point-of-sale or utility apps, for example, but not for users who need to access email or company resources.
Automatic enrollment via MDM: Joins the device with Azure Active Directory and enables users to sign in to Windows with their Azure AD credentials. If Auto Enrollment is enabled, the device is automatically enrolled in Intune.
Automatic enrollment via Group Policy: Configure Active Directory group policy to automatically enroll devices that are hybrid Azure AD joined. (Join on-premise domain, register to Azure AD device to enroll into Intune. Mainly for existing domain joined device.)
Windows Autopilot: Set up and pre-configure new devices, getting them ready for productive use.
Bulk enrollment: lets an authorized user join large numbers of new corporate-owned devices to Azure Active Directory and Intune. non-user affinity, can use device license.
https://learn.microsoft.com/en-us/mem/intune/fundamentals/deployment-guide-enrollment-windows
For your question, I think you need to uninstall Configuration Manager client after the workloads are all switched.
Hope the above information can help.
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