@Lukas, Thanks for posting in Q&A.
For Hybrid Azure AD join device, there are the following methods we can choose to do the enrollment:
- GPO enrollment
- Autopilot Hybrid Azure AD join
- Co-management
For all these methods, automatic enrollment is a required step to configure. And Azure AD Premium license is necessary. Here are the links with more details for your reference:
GPO enrollment:
Autopilot Hybrid Azure AD join
https://learn.microsoft.com/en-us/mem/autopilot/windows-autopilot-hybrid
Co-management
https://learn.microsoft.com/en-us/mem/configmgr/comanage/tutorial-co-manage-clients
Here, we suggest you consider Azure AD premium license in your plan.
Hope the above information can help.
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