Can't get gmail one click confirm action button working

Question

I am following the guidelines as described here
https://developers.google.com/gmail/schemas/reference/one-click-action

But It\'s just wont appear for me. As desc

Answer 1

If you check the email headers, I'd expect that no DKIM/SPF signature can be found, and that is required even for self-testing. Without the signature, anyone can spoof your email address and send you unwanted email with actions.