Normally I would now contact a responsible support, but since Minecraft has been in the hands of Microsoft, everything has unfortunately turned into a negative.
Since an update 2 days ago, Minecraft has told me that my data is incorrect.
The data has been the same for 10 years. Unfortunately, you can't get any further on the support page. Links with one of these new accounts and so is not possible.
Do you have a tip?
Reset Password
It's best to try to reset your password. If that doesn't work: off to support (this can be reached by email in any case. I've already written with him)
Think carefully about what your password and your name is.
Or reset your password.
It happens again and again that when you enter login data with copy and paste, there are spaces in front of and / or behind the password / email address.
It has proven useful to place the cursor in front of / behind it and simply use the backslash / remove button.
In most cases it works.
