About this question
I tried to use Salesforce DX to create a Scratch Org and use the "sfdx force:org:open" command to open it.
Then I reset the password for this user. And success reset it. But I can't use test.salesforce.com to login to this Scratch Org, it always shows an error message: Please check your username and password. May I ask if there is any solution to fix this issue?
I found the same issue in force.com GitHub but it did not help. https://github.com/forcedotcom/cli/issues/583