Google doc email template not respecting color and size formatting

TLDR: Generating an email body from a Word document template works (respects font sizes and colours). Generating an email body from the same template, but as a Google Doc, does not work (text appears, but the font colours and sizes are not respected). Why? Can I get the Google Doc template to work? It’s an awkward flow and our company is a Google suite company.

Here’s my google doc template:

Here’s the email it sent:

If i export the google doc template as a Word doc:

Then the email seems to work: