Pursuant to the EDPB Guidelines 8/2022, all of the following criteria must be considered when...

According to the EDPB Guidelines 8/2022, the lead supervisory authority of a controller is the supervisory authority of the main or single establishment of the controller in the EEA. The main establishment is the place where the controller has its place of central administration in the EEA, unless decisions on the purposes and means of the processing are taken in another establishment in the EEA, and that establishment has the power to implement those decisions. The controller must be able to demonstrate that such an establishment exists. The supervisory authority of the main establishment is the lead supervisory authority, regardless of what the controller has identified as the authority to which data subjects can lodge complaints. Therefore, criterion C is not relevant for identifying the lead supervisory authority of a controller.

References: EDPB Guidelines 8/2022 on identifying a controller or processor’s lead supervisory authority123, paragraphs 19-24.