If you have tried to Log In with the wrong credentials more than 10 time, than vicidial will lock that account for 15 minutes for security reasons.
There are couple of ways you can resolve this issue.
1. Wait for 15 Minutes: As the error message suggests, you will need to wait for 15 minutes before attempting to log in again. This waiting period allows the system to reset and remove the login attempt limit.
2. To reset a lockout, just go to the User Modify page and submit the form(you don't have to change anything). This will reset the counter and allow another 10 password attempts without having to wait 15 minutes.
3. Modify the User and Change the Password and share the New Password with the Agent, Make sure they are not using browser saved password. Changing the Password with the new one will also remove that 15 minute wait limit.
Let us know if these options help us out. If the user is still not able to log in please do not hesitate to reach out to our Help Desk.