Flow's Send Email Core Action + Text Templates

Y'all! The "Flow Limits and Considerations" section of H&T is insanely long and summing it up here would be a fool's errand. 

The tl;dr is that Flow is very much a work in progress and, while it's increasingly powerful, there are TONS of caveats and exceptions. 

In winterWinter 20',20, Salesforce updated visualFlow flowBuilder andto mademake text template componentsresources rich text as well as plain text. As such, if you are editinghave an existing Flow with a text template resource from pre-winter20' you will need to edit the Flow to ensure the proper type is chosen.

Specifically,

 

This is particularly an issue for using a text template as the source for the body of an email in a Send Email action. If you are using this text template when using an email core actionaction, you need to ensure you have the Plain/Rich option selected correctly for whichever Body input you choose to use for the action:

• Body (default): If you use this default Input, and a text template template as the source of it, that text template must be plain text or else it will render the rich texttext's asmarkup HTMLdirectly in the email.body. To change this, select select Plain Text from the drop down in the upper right.
• Rich-Text-Formatted Body (optional): alternatively, you can use a Text Template with Rich Text enabled and use this optional input to provide a formatted email body.