Possible to add more than one user?

I attempted to add more than one user in a profile, but any users added after the first are denied access, even though they appear to be the same in the database. So my setup looks like this:

	// USER
	$roles1[$sub_admin_rid] = 'role1';
	$roles2[$administrative_rid] = 'role2';
	install_add_user('user1', 'xxxx', 'user1@email.com', $roles1);
	install_add_user('user2', 'xxxx', 'user2@email.com', $roles2);

But, only user1 has access, the other is denied. I tried requesting a new password for user2, but no luck there either. Can you reproduce this issue?