It did you give you the option of specifying that what you had entered was HTML marked up text and would interpret the HTML tags and render it accordingly.

This Action is the original version that offered Body input with plain text, no formatting or styling supported. Let’s take a look at the first one, the Send an Email, then we will look at Send an Email (V2) (preview). If you search for Send Office 365 email Actions (not Triggers) you will get the following list. And while I expect this to be closed in the near future, I am going to show you two way on how to close that gap now in this blog post. In the context of the Microsoft Flow product there is currently a partial gap in this capability in the sense that you can’t do it from a toolbar function. The Microsoft Outlook client allows you to paste in images or construct signature blocks that contain images such as your company logo. Sending out emails from automated systems that include images has been a long established capability from all the popular bulk email platforms.

Add picture to outlook email signature