@Harold Junca III Thanks for posting in our Q&A.
For this issue, I have done the test in my lab. I will share your some information.
The request URL:
Post https://graph.microsoft.com/beta/deviceManagement/configurationPolicies{deviceConfigurationId}/assign
The request Body:
{
"assignments": [
{
"target": {
"@odata.type": "#microsoft.graph.groupAssignmentTarget",
"groupId": "xxxxxxxx"
}
}
]
}
It works well. Here is my test result:
Hope it will give you some ideas.
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