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Can you post the error that you're getting?

@great-queen-39697 This is full code

using Pulumi;
using AzureNative = Pulumi.AzureNative;

class MyStack : Stack
{
    public MyStack()
    {   
        //Management group
        var managementGroup = new AzureNative.Management.ManagementGroup("managementGroup", new AzureNative.Management.ManagementGroupArgs
        {
            Details = new AzureNative.Management.Inputs.CreateManagementGroupDetailsArgs
            {
                Parent = new AzureNative.Management.Inputs.CreateParentGroupInfoArgs
                {
                    Id = "/providers/Microsoft.Management/managementGroups/abb91b5c-16b1-4d24-96f6-9516b8daf6f9",
                },
            },
            DisplayName = "GroupName",
            GroupId = "GroupID",
        });

        var managementGroupSubscription = new AzureNative.Management.ManagementGroupSubscription("managementGroupSubscription", new AzureNative.Management.ManagementGroupSubscriptionArgs
        {
            GroupId = managementGroup.GroupId,
            SubscriptionId = "3a496a85-c5f3-4379-b7f8-b06f5fd09b44",
        });
    }
    
}

This is the error

MyStack.cs(24,39): error CS1061: 'ManagementGroup' does not contain a definition for 'GroupId' and no accessible extension method 'GroupId' accepting a first argument of type 'ManagementGroup' could be found (are you missing a using directive or an assembly reference?)

So, I didn't see anything, but I pinged a coworker who is better at C# than I am. Here's the response:

So I don't think that the 

GroupId

 that's an input to the 

ManagementGroup

 isn't the same as the input to the 

ManagementGroupSubscription

 - I think it should be 

managementgroup.id

 so it would look like this:

public MyStack()
    {
        //Management group
        var managementGroup = new AzureNative.Management.ManagementGroup("managementGroup", new AzureNative.Management.ManagementGroupArgs
        {
            Details = new AzureNative.Management.Inputs.CreateManagementGroupDetailsArgs
            {
                Parent = new AzureNative.Management.Inputs.CreateParentGroupInfoArgs
                {
                    Id = "/providers/Microsoft.Management/managementGroups/abb91b5c-16b1-4d24-96f6-9516b8daf6f9",
                },
            },
            DisplayName = "GroupName",
            GroupId = "GroupID",
        });

        var managementGroupSubscription = new AzureNative.Management.ManagementGroupSubscription("managementGroupSubscription", new AzureNative.Management.ManagementGroupSubscriptionArgs
        {
            GroupId = managementGroup.Id,
            SubscriptionId = "3a496a85-c5f3-4379-b7f8-b06f5fd09b44",
        });
    }

I haven't run that code yet, but I think that should work