My automation is not working or am I doing something wrong?

Hi everybody!
I have made something very simple which I cannot make it work.
Created a subscription form that I embedded on my website with iframe.
I have one contact list.
I created a welcome email automation with the option that when a contact is added on the list to send out after 2min a welcome email.

The form on the website is working as I see the new contact that are subscribed and have been added to my list.

But automation, that is active, refuses to process the list.

If I add manually a contact to the automation then it is being processed immediately.
I still use the free plan just to see if everything is working as I want.
Can anybody help?