I'm unable to login to Salesforce Workbench using a custom Salesforce domain for Sandbox environment. I'm getting the error invalid_grant:authentication failed. However if i try to sign on to a Salesforce.com production domain with another user, I was successful

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    Hi Kon, welcome to SFSE. Would you please edit your question to include the specific sequence of steps you perform that results in this error? Please also include any germane configuration details of your sandbox org (SSO, login policies, etc). – David Reed Apr 19 '19 at 7:21

I finally figured out the issue. I selected Production in the Environment drop down when I should have selected Sandbox instead

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