Overview
Placing various M-Files URL placeholders in workflow notifications results in the links being displayed as plain text in the notification message. Only the "M-Files hyperlink (HTML)" placeholder %HYPERLINKFRAGMENTHTML% and "M-Files Web URL" placeholder %WEBURL% are automatically rendered as a clickable links.
Solution
However, you can wrap the other link placeholders in HTML link tags to convert them into valid hyperlinks in the notification message.
The screenshot below illustrates how to do this with the %MFILESURL% and %MOBILEURL% placeholders:

