Please note that the default text formatting in Redmine is
Textile, which uses HTML tags for formatting. In order to switch to Markdown, you need to access the
Administration > Settings panel for Redmine (
/settings), and in the
General tab, change the
Text Formatting option to
Then, creating a new issue, there is a tab for previewing the resulting message, please see the below screenshot:
Could you check if this works for you?