Issue with logging into account

I am not able anymore to play Minecraft.

 

Today I have migrated from Mojang to Microsoft Acccount.

I got an e-mail that this was successful.

 

But now I am not able to login into the Minecraft Launcher.

It tells me, the login is invalid.

I can login with this password into my Microsoft account, so  there  is no issue with this account.

 

I did restart Minecraft Launcher and the Laptop, but this did not help.

I did try to reset the password via the launcher, but did not get an e-mailt to do so.

 

Please help