§1. If the election requires confirmation, the person elected must personally or through another seek confirmation from the competent authority within eight useful days from the day of acceptance of election; otherwise, the person is deprived of every right unless it has been proved that the person was prevented from seeking confirmation by a just impediment.
§2. The competent authority cannot deny confirmation if the person elected has been found suitable according to the norm of can. 149, §1, and the election was conducted according to the norm of law.
§3. Confirmation must be given in writing.
§4. Before being notified of confirmation, the person elected is not permitted to become involved in the administration of the office, whether in matters spiritual or temporal, and acts possibly placed by the person are null.
§5. Once notified of the confirmation, the one elected obtains the office in full right unless the law provides otherwise.
Source: Code of Canon Law (Vatican.va)