Email templates: Placeholders not evaluated?

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Hello everybody, for some reason, the placeholders in emails are not evaluated:

Using this template:

export const twoFAtemplate = {
    subject: '2FA code',
    text: `Hey <%= user.firstname %> , twoFA code: <%= twoFAtoken %>.`,
    html: `<h1>Hey <%= user.firstname %> !</h1>
      <p>twoFA code: <%= twoFAcode %>.<p>`,
  };

with the following code:

import { twoFAtemplate } from './mailtemplates';

export const send2FAtoken = async (user: {email: string, firstname: string, [key: string] : any} , twoFAtoken: number) => {
    await strapi.plugins['email'].services.email.sendTemplatedEmail(
        {
          to: user.email,
          // from: is not specified, the defaultFrom is used.
        },
          twoFAtemplate,
        {
          user: user,
          twoFAtoken: twoFAtoken
        }
      );
}

but what I receive is exactly this:

image
image840×256 27.5 KB

I followed the docs, what’s wrong about my code ? Thank you in advance !