best response confirmed by Ivan Palikuca (Occasional Contributor)
Solution

@Ivan Palikuca 

 

I have tested the case, both cases are working fine in my end. Actually you have to replace the {itemId} by <sub folder id> and you should not include the sub folder name (General) in graph url.

 

For example :

 

https://graph.microsoft.com/v1.0/groups/{groupId}/drive/items/{folder_Id}/invite

 

https://graph.microsoft.com/v1.0/groups/{groupId}/drive/items/{sub_folder_Id}/invite

 

You should not provide like below URL :

 

https://graph.microsoft.com/v1.0/groups/{groupId}/drive/items/General/{sub_folder_Id}/invite

 

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