Are you using an email client to view your email? Is it possible that your email client only views email as plain text?
If your template has "use only plain text" unchecked, then it should send as html.
I would debug your send email microflow and see what values are being set for the Email object that is being created. Specifically if use as plain text is false, and if the html body attribute contains an html string.
Hi Austin, Just checking the obvious maybe it helps:
Can you confirm by looking at your template configuratioN:
#2: HTLM template existing
#3: Text template not relevant
#4: Tokens appear in appropriate styling?
Note that #1 is on the top right outside the box :-)