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In fact, it does affect validity in the case of two sacraments. From the Latin Code:Faculty always affects licety only. It’s absence doesn’t invalidate a sacrament.
Can. 966 §1. The valid absolution of sins requires that the minister have, in addition to the power of orders, the faculty of exercising it for the faithful to whom he imparts absolution.
Can. 1108 §1. Only those marriages are valid which are contracted before the local ordinary, pastor, or a priest or deacon delegated by either of them…
The Eastern Code says basically the same thing:
Canon 722 §3. For presbyters to act validly, they must be previously granted the faculty of administering the sacrament of penance, which is conferred either by the law itself or by a special grant made by a competent authority.
Canon 828 §1. Only those marriages are valid which are celebrated with a sacred rite, in the presence of the local hierarch, local pastor, or a priest who has been given the faculty of blessing the marriage by either of them…