I created a Connected App and I set the permitted users to self-authorized.

After trying to get the access token via the curl command, I keep getting the error: {"error":"invalid_grant","error_description":"authentication failure"}

I also requested a new security token. Please note this process worked with my employee email but it isn't working with a service account, if that helps.

I created a Connected App and I set the permitted users to self-authorized.

After trying to get the access token via the curl command, I keep getting the error: {"error":"invalid_grant","error_description":"authentication failure"}

I also requested a new security token. Please note this process worked with my employee email but it isn't working with a service account, if that helps.