its probably already taken. try a new one.
No, you cannot have the letter Ä in a username on WikiAnswers. You will get the error message: "Invalid Username: Only letters, numbers and underscores are allowed!"
An invalid username typically does not meet the required criteria of being 4 to 12 characters long and consisting solely of alphanumeric characters. This means that it may be too short or too long, or it could include special characters or spaces. To create a valid username, ensure it is within the specified length and only contains letters and numbers.
It is an invalid arrangement of Roman numerals
You can't. Youtube only lets you put letters and numbers in your username.
No, you don't have too.
The username you entered contains characters that are not letters or numbers. If you entered a space or a dash (-) you'll probably get this error.
It comes back as an invalid code.
Any you wish
0019
0019
It is an invalid arrangement of Roman numerals but if you meant mmxviii it is equivalent to 2018
2600Improved Answer:-It is invalid in Roman numerals and 2600 = MMDC