There is really known problem Client does not support authentication protocol. But in that case there should be another error, yours clearly say that you have unsufficient rights to connect to db.

In reply to Re: DBI / mySQL: Access denied for user 'myusername'@'localhost' (using password: YES) by idle
in thread DBI / mySQL: Access denied for user 'myusername'@'localhost' (using password: YES) by TedPride

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