Ideally In AD sAMAccount attribute is to map with userId in ACM. for some user sAMAccountName is same but mail is unique, if i map mail with UserID i'm getting orphaned user, so plse some one help is there any other AD attribute to map with UserID other than sAMAccountName?
If I understand your question correctly, you are looking to map an AD account to an identity.
You can map the account based on any field you want.
Obviously, you need to have the same value in your HR (identities/users) source and in your AD.
If you want to map an account using an email address, then you need to collect an email from your HR source.