authentication with domain name into vRA

[rgaduput]

Hi,
Our vRA authentication is setup with different domains, while logging in manually we choose a specific domain and then enter user name and password.
how to achieve this in terraform, when I am providing the user name and password with out any domain for provider vra7 it fails with authentication issue.
I have tried to provide the domain as prefix to the user name DOMAIN.LOCAL\\USERNAME, still it fails with .

Error: Unable to get auth token: vRealize API: [{Code:90135 Message:Unable to authenticate user rgaduput in tenant DEV_Group. SystemMessage:90135-Unable to authenticate user rgaduput in tenant DEV_Group.} {Code:400 Message: SystemMessage:}]

Error: Error: Unable to get auth token: vRealize API: [{Code:90135 Message:Unable to authenticate user DEV.LOCAL\rgaduput in tenant DEV_Group. SystemMessage:90135-Unable to authenticate user DEV.LOCAL\rgaduput in tenant DEV_Group.} {Code:400 Message: SystemMessage:}]

Any suggestion on how to use user name with domain combination ?