Can't connect to Service Bus Emulator from Functions even though it works through API server

I'm using .NET Aspire with an ASP.NET api server, Azure service bus and Azure functions (isolated worker model), all running locally.

However, the problem is that I can't seem to connect to service bus from function, even though I have checked that the connection string provided is the same. It can neither consume or write to the queue, and it hangs indefinitely.

string? connectionString = Environment.GetEnvironmentVariable( "SERVICE_BUS_CONNECTION_STRING"); await using var client = new ServiceBusClient(connectionString); string queueName = "tasksQueue"; ServiceBusSender sender = client.CreateSender(queueName); ServiceBusMessage message = new ServiceBusMessage("Health check message"); await sender.SendMessageAsync(message);

My code to send, and in debugger, it's stuck at last line. After a while, it returns "No connection could be made because the target machine actively refused it."

A few checks I have done:

Connection string is there during runtime in debugger and this same string works for api server to the service bus. The connection string is passed by Aspire and it is
Endpoint=sb://localhost:34628;SharedAccessKeyName=RootManageSharedAccessKey;SharedAccessKey=SAS_KEY_VALUE;UseDevelopmentEmulator=true;
And I have attached a photo of the Aspire resources page and all seems to be running without any errors. The queue specific with name tasksQueue already exist in service bus.

I couldn't find any solution to this online and I have been stuck for a while so I appreciate any help. Maybe there is some firewall blocking the access, but this is all running locally, so I couldn't find anything that would block it.