Judgment_paragraph 48 · X v Udlændinge- og Integrationsministeriet (C-689/21)

48In the light of the serious consequences created by the loss of the nationality of a Member State, where that loss entails the loss of citizenship of the Union, for the effective exercise of the rights which citizens of the Union derive from Article 20 TFEU, national rules or practices which are liable to have the effect of preventing the person exposed to that loss of nationality from seeking an examination of the proportionality of the consequences of that loss from the point of view of EU law cannot be regarded as compatible with the principle of effectiveness, on the ground that the time limit for requesting that examination has expired, in a situation in which that person has not been duly informed of the right to request such an examination and of the time limit for lodging such a request.