If you have correctly joined your devices to EntraID and you have an Intune license, then these devices should appear in the Intune Management console, as shown above.
If they don’t, then go into the Azure Portal and select EntraID. Select the Mobility (MDM and WIP) as shown above. Then select Microsoft Intune.
Ensure that both settings are set to All. If they have been set to None, then this will be the issue as EntraID is not handing off device management to Intune.
Once you have set both of these settings to All as shown, ensure you save these settings before exiting the page.
Any device that is now joined to the tenant should appear in Intune, however existing devices that were added prior to this update being made won’t automatically enrol in Intune. They will need to be unjoined and re-joined to EntraID or re-enrolled via a script.
CIAOPS 
Great article, at the end of your post you suggest for any devices already enrolled, they will need to be re-enrolled or re-joined. What script do you suggest to re-enroll?
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Yes I have a script but it is available only via subscription to http://www.ciaopspatron.com/ However, if you hunt around the web you’ll find others who have created one.
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