Final answer:
The unique features of the Power Virtual Agents web app in a Microsoft 365 environment are to allow the usage of the chatbot by users outside of the company and to enable the chatbot to be used on your company's website.
Step-by-step explanation:
In the context of Microsoft 365 and Power Virtual Agents, two unique features that the Power Virtual Agents web app provides are - Option 1: Allowing users outside your company to use the chatbot, and Option 4: Using the chatbot on your website.
With Power Virtual Agents, you can enable external users to interact with your bot. Additionally, you also have the ability to embed this bot on your website for greater accessibility and interaction. However, allowing users inside the company to modify the bot without additional licensing, and creating a bot using a template are not exclusive features of the Power Virtual Agent's web app only - they can also be accomplished within Microsoft Teams.
Learn more about Power Virtual Agents