Unable to add application assignment using Microsoft Graph API - azure-active-directory

Question

When creating a request to assign an app to an AD group in Azure Intune using the graph API, i get the following response.
{ "error": {
"code": "ModelValidationFailure",
"message": "Cannot create an abstract class.",
"innerError": {
"message": "Cannot create an abstract class.",
"request-id": "removed",
"date": "removed"
} }}
and here's my post data
{ "#odata.type": "#microsoft.graph.mobileAppAssignment", "intent": "required", "target": { "#odata.type": "microsoft.graph.groupAssignmentTarget", "groupId": "removed" }, "settings": { "#odata.type": "microsoft.graph.mobileAppAssignmentSettings"}}
Here's the reference i've used to generate the json data: https://learn.microsoft.com/en-us/graph/api/intune-apps-mobileappassignment-create?view=graph-rest-beta
And I'm not sure if it something to do with my json input or if the graph api endpoint has an issue.

Answer 1

microsoft.graph.mobileAppAssignmentSettings is an abstract class. You'll need to provide a concrete implementation of assignment settings e.g. microsoftStoreForBusinessAppAssignmentSettings or iosStoreAppAssignmentSettings.
Your post data in this case could be:
{
"#odata.type": "#microsoft.graph.mobileAppAssignment",
"intent": "required",
"target": {
"#odata.type": "microsoft.graph.groupAssignmentTarget",
"groupId":"removed"
},
"settings": {
"#odata.type": "microsoft.graph.microsoftStoreForBusinessAppAssignmentSettings",
"useDeviceContext":"true"
}
}