Hi @Sajith G H
did you tried use SharePoint PnP Core Online nuget package?
You could use AuthenticationManager.GetADFSUserNameMixedAuthenticatedContext method, something like this
var siteUrl = "<a href="https://tenant.sharepoint.com" target="_blank">https://tenant.sharepoint.com</a>";
var userName = "username";
var password = GetSecureString("password");
var domain = "domain";
AuthenticationManager authManager = new AuthenticationManager();
ClientContext context = authManager.GetADFSUserNameMixedAuthenticatedContext(siteUrl, userName, password, "sts.company.com", "idpId");
Please, check official docs in order to understand better all method parameters.
Cheers,
Federico
