I attended a Chupa from a Chatan of Sephardi background and after the Chupa there was Yichud (the seclusion of the groom and bride in a private room) as accustomed by Ashkenazim. Is it correct for Sephardim to do so?

B’mechokek Mishanosom (20: 4) quotes Horav Ben Zion Abba Shaul Zt’l, saying that although there are different opinions by the Sephardi Poskim regarding the issue, since the established tradition is that Sephardim don’t perform Yichud, one belonging to that community should also not be stringent and do it, since he would be putting down many prior centuries of marriages. (See also Yabia Omer E.H. 5; 8)