According to the AI-900 Microsoft Learn modules on Conversational AI, a custom question answering solution built using Azure AI Language (formerly QnA Maker) enables a chatbot to respond to user questions based on a predefined knowledge base. When integrated with a bot, the solution can automatically respond to multiple user queries in real time without additional programming.
This capability is known as scalability and concurrency, which allows chatbots to manage simultaneous conversations with multiple users. This feature is built into the Azure Bot Service, meaning you don't need to add extra "skills" or custom logic for concurrent interactions.
Other options require additional integration or logic:
* Register customer complaints or purchases would require connecting the bot to a CRM or sales system.
* Provide RMA numbers requires business process logic or database access.
Therefore, the out-of-the-box functionality of a custom question answering bot is the ability to answer questions from multiple users at once, which is supported natively by Azure Bot Service and the QnA knowledge base.