Things did work fine. Domain was approved, and testing gave the right result.
However, my plan for using Twitter card has just changed.
Instead, I would just want to put my domain: http://poptoo.net without showing card.
It’s because when I want to mix with other web links like YouTube’s, my Twitter card took precedence, against my intention.
So, I removed all from PopToo.net, but the Homesite’s title image is still appearing on the left ‘Photos and video’ gallery block.
It seems to be cached and I wonder how long it will take to be cleaned up.
How can I confirm Twitter card is deactivated with the absence of from the formerly validated URL?
Or if I should wait, how long?