The Mysql is 'case sensitive', therefore it is necessary for you to pay attention to capital/lower-case letters.
In particular every login is formed by the suffix 'Sql' (attention to the initial capital s) followed by five numbers.

I.e. Sql00000

While the password has only the length as a common point: it is always formed by eight characters, therefore if there happen to be any characters different to the alphanumerical, you need to enter them.