Mysql8.4.3连接报错 返回

链接8.4.3版本MYSQL报错，中文提示 :  连接数据库过程中发生错误，检查服务器是否正常连接字符串是否正确，错误信息：Exception has been thrown by the target of an invocation.DbType=\"MySql\";ConfigId=\"\".\r\nEnglish Message : Connection open error . Exception has been thrown by the target of an invocation.DbType=\"MySql\";ConfigId=\"\" 

但是连接5.7版本MYSQL正常，是连接字符串出错了吗？

<add key="mysql" value="Data Source=localhost;port=3306;Database=yiweb;User Id=root;Password=3688888;pooling=true;Min Pool Size=0;Max Pool Size=20;CharSet=utf8mb4;SSL Mode=None;"/>