Hi @Patrick Mor ,
Thank you for posting in Microsoft Q&A forum.
1,==>And, to use CMG I need to keep SCCM in the environment, right?
Yes, you are right.
2,In that case is there any advantages to use CMG? If yes, what advantages are that?
Many folks attempt to view co-management as a remote solution for their Internet-based ConfigMgr managed clients. This will not work and is not the design intent for co-management. If your clients are remote/connected over the Internet and they are managed by ConfigMgr, you must have a CMG (or IBCM or a VPN), regardless of co-management, to manage them. Without this, you will have issues.
ConfigMgr is better at some things such as patching and Intune is better at others so such installing the ConfigMgr client over the Internet. As such situation, I would suggest using them both, they are complimentary and you'll have more to gain by using them both together.
Here’s a good post on co-management, CMG and tenant attach.
Thanks for your time. Have a nice day!
Best regards,
Simon
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