Please elaborate.
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Well I’m not sure what elaboration would elucidate what I’ve posted, and at the moment I’m not aware of any example that could be cited. But it’s obvious the term “full communion” would not be applicable to someone who has been advised he/she could not receive the Sacrament of Holy Communion due to continuous willful behavior that is prohibited by established Church doctrine.
Have seen the term used in an informal and loose way to refer to baptized individuals, already self-described Christians, individually discerning and fatefully making the One True leap of Faith (i.e., finally becoming Catholic).
You appear to be referring to purportedly backsliding individuals. That is, people who unequivocally were Catholics at some prior time, or who now say they are Catholics, or honestly consider themselves Catholics, but according to certain others suffer from some kind of categorical disqualification, leaving them on the outside, looking in, despite sincere protestations, or other types of claims they, or the group they are in, might make to the contrary.
To sum up, the One True Faith is the ultimate destination religion.
Once there, either from birth or by means of sincere sacramental conversion, it’s as if you are a Natural Born Citizen of the Kingdom of Heaven. Nobody can externally “dis-seize” you of that status but your foolish or heretical actions, taken deliberately according to your own free adult will, specifically amounting to apostasy, or objectively producing schism. By then it would be sugar coating things to refer to you as “not being in full communion” with Holy Mother Church. Your her enemy!