Agents are receiving the error, "The dbname and launch parameters must be specified on first run" when trying to log in.
Oracle B2C Service Supported versions
The Oracle B2C Service application is deployed using Microsoft's ClickOnce technology. That process first creates and then places some files in the ClickOnce application store in the users Windows profile.
The dbname and launch parameters must be specified on first run error occurs when those files are missing, renamed, or access to them blocked.
The most common cause of this issue is the use of Windows Roaming profiles. Please see the following regarding Roaming Profiles.
Another possible cause of this issue is the use of the New Microsoft Edge Browser where ClickOnce is not enabled by default. To enable ClickOnce, please use the steps provided in Answer 11587: Can't download .Net Console in latest Microsoft Edge Version
Remediation of this issue varies depending on the cause. Please contact Technical Support regarding this issue for further investigation.