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Hmm, odd. We have this call in our test suite and it works fine <https://github.com/pulumi/pulumi-azure-native/blob/3e3cf5fefca7a4580aef0fc313635ff76c6d0428/examples/cs-simple/MyStack.cs#L75>

&gt; I am calling this async method from the main Pulumi code using getawaiter,
GetAwaiter doesn’t block on its own. Could you show your code?

This is the method:
```        static async Task&lt;string&gt; SetIpGroupIp(string ipGroupId, string ip)
        {
          
                var ipGroupResourceGroup = ipGroupId.Split("/")[4];
                var ipGroupName = ipGroupId.Split("/")[8];
                var token = await Pulumi.AzureNative.Authorization.GetClientToken.InvokeAsync();
                var networkClient =
                    new NetworkManagementClient(new TokenCredentials(new StringTokenProvider(token.Token, "Bearer")))
                    {
                        SubscriptionId = ipGroupId.Split("/")[2]
                    };
                var ipGroup = (await networkClient.IpGroups.GetWithHttpMessagesAsync(ipGroupResourceGroup, ipGroupName))
                    .Body;
                Log.Warn(ipGroup.IpAddresses[0]);
                if (!ipGroup.IpAddresses.Contains(ip))
                {
                    ipGroup.IpAddresses.Add(ip);
                    await networkClient.IpGroups.CreateOrUpdateWithHttpMessagesAsync(ipGroupResourceGroup, ipGroupName,
                        ipGroup);
                }
                return ip;
        }```

and this is how it is called
```        if (!Pulumi.Deployment.Instance.IsDryRun)
        {
            aksIp.Apply(ip =&gt;
            {
                var aksip = SetIpGroupIp(config.Require("AKSIpGroup"), ip).GetAwaiter().GetResult();
                return aksip;
            });
        }```

This may be <https://github.com/pulumi/pulumi/issues/3991>

Can you try returning the result of `Apply` as a stack output?