Unable to send emails using a template

[vihuvac]

Following the documentation to send an email using a template does not work, I am trying to send an email using the API v3.1, e.g: Guide to use a Template.

I even tried to instantiate the apiConnect as in this documentation but non of the previous guides worked.

I inspected the request and the mails apparently were sent without errors, but in the mail report they appear as blocked. When I tested the template, the email was sent successfully, the template is currently active. I got two emails verified to act as senders.

The following snippet is being executed within an async function, the response return a 200 status code with some more details without errors but the mails appear as blocked in the report:

const request = await mailjet.post('send', { version: 'v3.1' }).request({
  Messages: [
    {
      From: {
        Email: '<SENDER_EMAIL>',
        Name: '<SENDER_NAME>',
      },
      To: [
        {
          Email: '<DESTINATION_EMAIL>',
          Name: '<DESTINATION_NAME>',
        },
      ],
      TemplateID: 12345678, // This is not the real templateID.
      TemplateLanguage: true,
      Subject: '<EMAIL_SUBJECT>',
    },
  ],
});

Can someone help me please?