Unsuccessfully granting privileges
According to the MySQL Documentation, this feature was deprecated: https://dev.mysql.com/doc/refman/5.7/en/mysql-nutshell.html#mysql-nutshell-deprecations

Changes to account-management statements make the following features obsolete. They are now deprecated:

Using GRANT to create users. Instead, use CREATE USER. Following this practice makes the NO_AUTO_CREATE_USER SQL mode immaterial for GRANT statements, so it too is deprecated.

Using GRANT to modify account properties other than privilege assignments. This includes authentication, SSL, and resource-limit properties. Instead, establish such properties at account-creation time with CREATE USER or modify them afterward with ALTER USER.



The solution is to use two separate statements. One to ALTER USER, then a second to GRANT privs.
ALTER USER 'br' IDENTIFIED BY 'password';
GRANT ALL PRIVILEGES ON simple_cms_development.* TO 'br'@'localhost';