Minecraft Homepage Login?

I've been trying to log into the Minecraft Launcher for a while. After entering the data, an information window appears at the top right (see photo).

I've already tried a few things that MC Support suggested to me:

Reinstallation

Log in with the administrator

Graphics card update

Deactivate antivirus program / firewall

I do not use mods, third-party software or the like.

The login does not work on the MC homepage either.

I enter my details, click on register and nothing happens! I've tried a few browsers - none of them log in.

I hope you can help me here. Thanks.

Have you ever tried to log in with the same data on another device?

The alleged lack of internet access comes in the launcher. The login on the homepage is not that important.

Is that a Mojang or a Microsoft account?

It's a Mojang account that was created long before October 2020. I also have the choice in the launcher - whether Microsoft or Mojang login.

Maybe try resetting your password. Maybe the wrong error message is displayed…

I've already done it 3 times. There's always the same hint that I should check whether I'm online

Is it possible that your internet is very weak?

Absolutely not. Everything else, but also everything else, works perfectly!

I can register on the Mojang homepage without any problems. Only the MC Launcher and the homepage are crazy.