SFDX - Error authenticating with auth code due to: grant type not supported

Common error when authenticating from SFDX CLI


Andres Canavesi
Apr 27, 2021
Error authenticating with auth code due to: grant typw not supported. This is most likely not an error with the Salesforce CLI. Please ensure all information is accurate and try again
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You are trying to log in through an instance URL (example: sandbox) and you do this.

      
sfdx auth:web:login -a myusername@myorg.sandbox --instanceurl=https://mysandbox-domain.lightning.force.com

And you get this error in console:

In your browser you get this

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The problem is you are using lightning.force.com domain instead of my.salesforce.com

      
sfdx auth:web:login -a myusername@myorg.sandbox --instanceurl=https://mysandbox-domain.my.salesforce.com

Photo by Sebastian Herrmann on Unsplash