Our deacon who conducts our RCIA classes, which also includes several baptized Catholic adults who have never been confirmed, has told us that the Catholic couples who have been married civilly must have their marriages blessed (convalidated) before thay can receive confirmation and/or communion. that is because they must go to confession first, and obviously they cannot be absolved if they are still in an objective state of sin. We do not speculate on the state of sin or state of soul of any person in the class, but refer them to the pastor for private counselling about their personal situation. We assume they are conducting their private life in conformity with what the priest tells them. If he says the marriage needs to be blessed, that is done first. If he determines their is a situation regarding a previous marriage that requires referral to the tribunal, that is done and resolved first.
In our class of 7 adults, plus 4 more couples, each marriage situation is different and has to be addressed differently, which is why the deacon and pastor take care of it, and then tell the RCIA team the order of sacraments for each person.