Minecraft login does not work somehow?

I got a mckey card recently. Then I tried of course on the mcseite mc to buy it. However, when I tried that, it was always there that I should try it again later. I tried that, but it did not work. Then I tried it on another laptop, where everything worked immediately and I could play it too. When I try to log on to my pc now on the launcher, he says that the password is wrong. I've changed it several times now, but it still does not work. Why?

I had that at another game, it did not work, I had to wait a while. After a few days it went.