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Unknown MySQL server host

This code was working before, but now getting an unknown mysql host error when I try to dump my database.

mysqldump -u username -h username.mysql.pythonanywhereservices.com ' username$db_name'  > db-backup.sql

mysqldump: Got error: 2005: Unknown MySQL server host 'username.mysql.pythonanywhereservices.com' (0) when trying to connect

If I add the dash:

mysqldump -u username -h username.mysql.pythonanywhere-services.com ' username$db_name'  > db-backup.sql

then I get this error: mysqldump: Got error: 1044: Access denied for user 'user'@'%' to database 'username$db_name ' when selecting the database

Just to be sure -- did you run literally those commands or with using your actual username instead of "username"?