Mautic tokens not rendered

Hello there,
I’m using the tokens in my e-mails like:

Hello {contactfield=firstname} !

And when sending a test e-mail to a test contact, I get

Hello [First Name]

No error show up, this is not a preview e-mail, and only some tokens work like the {unsubscribe} one, but not firstname, lastname, city and so on. The contact has content in each of these fields…
Any help?
Thank you.

Ok, it’s just not working for test e-mail!

send mail by campaign and check whatever you implement in your mautic. This is best practice