@Tech, Thanks for posting in Q&A. From your description, it seems you have error to add group into assignment when we create profile in Intune. If there's any misunderstanding, feel free to let us know.
To add group under device configuration profile, we can assign the related permission via the following methods:
- Create a Role that include Device configuration permission and Organization Read permission.
- Add role assignment, set admin group (Admin group users are the administrators assigned to this role), Set Scope group and add the groups you want to add under profile assignment.
- After waiting some time, then test again to see if we can add the group under device profile assignment.
Here is a link with more details for your reference:
https://learn.microsoft.com/en-us/mem/intune/fundamentals/role-based-access-control
However, if the issue still persists, please collect the following information to clarify:
- What is the error when we add group under the device configuration profile? Please get a screen shot.
- Please get screen shot where you add the group.
- What permission you have under Intune and AAD?
Please try the above suggestion and if there's anything unclear, feel free to let us know.
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