Bought Minecraft yesterday, but sign in doesn't work?

I bought Minecraft yesterday and wanted to start playing today, but in the launcher the error occurred with the correct login data: "Email address or password is invalid"… I reset the password but still no login is possible!
On Minecraft.net I can log in with the same login data!

Simply download the launcher again and try it.

I have, unfortunately without success

First the simplest first: Did you create an Xbox Live or Microsoft account with which you can log in there? And is your Windows up to date and a stable internet connection there?

I use Minecraft Java Edition on Windows 10 up to date with a stable internet connection!

From purchase, it can take up to 24 hours before you can register anywhere. Usually goes faster but can also take longer.