Getting some strange behaviour with the markdown for approvals.
It's formatting correctly when view through Flow in the browser, but not in the email.
Not all things mentioned in the table here - worked for me. But after many trials, a simple one column table markup in approval action has worked. This is tested in Outlook desktop app and outlook web (Windows 10 machine) .
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Power Platform release plan for the 2021 release wave 2 describes all new features releasing from October 2021 through March 2022.