Scenario 7: EduCCS is an online education platform based in Netherlands.

Scenario 7: EduCCS is an online education platform based in Netherlands. EduCCS helps organizations find, manage, and deliver their corporate training. Most of EduCCS's clients are EU residents. EduCCS is one of the few education organizations that have achieved GDPR compliance since 2019. Their DPO is a full-time employee who has been engaged in most data protection processes within the organization. In addition to facilitating GDPR compliance, the DPO acts as an intermediary point between EduCCS and other relevant interested parties. EduCCS's users can benefit from the variety of up-to-date training library and the possibility of accessing it through their phones, tablets, or computers. EduCCS's services are offered through two main platforms: online learning and digital training. To use one of these platforms, users should sign on EduCCS's website by providing their personal information. Online learning is a platform in which employees of other organizations can search for and request the training they need. Through its digital training platform, on the other hand, EduCCS manages the entire training and education program for other organizations. Organizations that need this type of service need to provide information about their core activities and areas where training sessions are needed. This information is then analyzed by EduCCS and a customized training program is provided. In the beginning, all IT-related services were managed by two employees of EduCCS. However, after acquiring a large number of clients, managing these services became challenging That is why EduCCS decided to outsource the IT service function to X-Tech. X-Tech provides IT support and is responsible for ensuring the security of EduCCS's network and systems. In addition, X-Tech stores and archives EduCCS's information including their training programs and clients' and employees' data. Recently, X-Tech made headlines in the technology press for being a victim of a phishing attack. A group of three attackers hacked X-Tech’s systems via a phishing campaign which targeted the employees of the Marketing Department. By compromising X-Tech's mail server, hackers were able to gain access to more than 200 computer systems. Consequently, access to the networks of EduCCS’s clients was also allowed. Using EduCCS's employee accounts, attackers installed a remote access tool on EduCCS's compromised systems. By doing so, they gained access to personal information of EduCCS's clients, training programs, and other information stored in its online payment system. The attack was detected by X-Tech’s system administrator. After detecting unusual activity in X-Tech’s network, they immediately reported it to the incident management team of the company. One week after being notified about the personal data breach, EduCCS communicated the incident to the supervisory authority with a document that outlined the reasons for the delay revealing that due to the lack of regular testing or modification, their incident response plan was not adequately preparedto handle such an attack.Based on this scenario, answer the following question:

Question:

Based on scenario 7, due to the attack, personal data ofEduCCS' clients(such as names, email addresses, and phone numbers) were unlawfully accessed.

According to GDPR,when must EduCCS inform its clientsabout this personal data breach?