INVALID_LOGIN when logging into Sandbox

[manfred1201]

I tried to login into my sandbox using the command below:
sf = Salesforce(username='xx@xx.com.sandbox_name', password='xx', security_token='xx', domain='test')
the "sandbox_name" is the name of my sandbox. I already reset the token in my sandbox account and the log in information should all be correct.

Here is the error I got:

SalesforceAuthenticationFailed: INVALID_LOGIN: Invalid username, password, security token; or user locked out.

And also, I cannot see this login history in my account setting.

[manfred1201]

And everything works fine when I log into the production account.

[john77eipe]

This is how I use it
sf_client = Salesforce(instance_url='https://<sub-domain>.sandbox.my.salesforce.com', username='<username>' , password='<password>', security_token='<security token>', domain='<sub-domain>.sandbox.my')

I'm using the sandbox.my domain. You need to add the appropritate sub-domain.