I know this is the old way of doing things,.

I have multiple domains in the same forest and a service account in one domain that I'm trying to use to join another domain.  I'm just wondering how I need to specify the service account's domain on the directory binding I created.

In Jamf's directory Binding there are fields for domain, username, password, verify passsword, and OU:

For domain I specified the domain I want to join, not the domain the service account resides in.

For username I have just the simple username of the service account.  Do I need to specify it in the SIP format?  user@domain?  Or maybe with a backslash?  domain\\username?