Issue with Azure AD Enrollment and Intune Device Visibility

We are trying to enroll our devices into Azure AD and manage them using Intune. However, we're unable to find the option to enroll the devices through Azure AD."Join this device to Azure Active Directory"

As a workaround, we tried signing in directly with the user's account on the device. While this successfully registers the device in Intune, the device does not appear in Microsoft Entra ID.

Could you please help us understand why the device is being registered only in Intune and not showing up in Entra ID, and advise us on the correct enrollment process?