How to read service bus when requested?

Question

ASP.NET

Hello, I am making a service in which users are given messages that users must process and say that they have processed it. It is very important that one message is executed once - by one user, so I immediately got the idea to use the message queue, and everything was fine until I needed to read it.
I have ASP Net Core API
https://docs.microsoft.com/en-us/azure/service-bus...
I successfully created messages in the queue, but in order to subtract them, I need to create a message arrival event handler, and I need to give a message from the queue when requested (GetMessage()), so this method does not suit me. I considered the option to create an Azure Function for subtraction, and throw them into the API with the POST method and write it to the cache, but this is a terrible idea because the API will be deployed in several instances.
Are there similar services for this? preferably free (I do not have a commercial application) so that there is a method like ReadNextMessage () and the usual WriteMessage ()