Heart failure (HF) in adult patients with congenital heart disease is a major cause of morbidity and mortality. Approximately 30% of patients with significant congenital heart disease will develop signs of heart failure. Heart failure leads to hospitalization and disability with a longer hospital stay and higher health care costs as compared to heart failure patients without congenital heart disease. One-third of deaths in patients with congenital heart disease are attributable to heart failure. In patients with heart failure and reduced ejection fraction (EF), 2021 ESC recommendations suggest the use of sodium-glucose co-transporter 2 inhibitors (SGLT2i) (dapaglifozin and empaglifozin), a new therapeutic class for heart failure (HF), in a class IA recommendation. In addition to reduced EF, these molecules have shown efficacy in preserved EF, leading to their reimbursement in both preserved and reduced ejection fraction in France. Unfortunately, given the relatively low number of HF-congenital heart disease, patients, they were not included in previous studies. However, the seriousness of their condition and the absence of therapeutic explain the prescription of SGLT2i in those patients and the likelihood of increased use in the future. This especially underlines the need for safety data in this real-world population. To date, no data on the safety or efficacy of SGLT2i in HF-congenital heart disease have been published. The results of this study would provide reassurance about the safety of SGLT2i in adult congenital patients and potentially expand the indication of SGLT2i in HF related to congenital heart disease The objective of this study is to assess on real-life data, through a multicenter registry: * The efficacy of SGLT2i in patients with heart failure related to congenital heart disease - The indications of SGLT2i use (type of congenital heart disease) * The safety of SGLT2i (collection of adverse events)