(Bloomberg) -- Facebook Inc.’s WhatsApp was ordered to pay a 225 million-euro ($266 million) penalty for failing to be transparent about how it handled personal information, its first fine under beefed-up European Union data protection law.

The Irish Data Protection Commission -- Silicon Valley’s main privacy watchdog in Europe -- said it found violations in the way WhatsApp explained how it processed users’ and non-users’ data, as well as how data was shared between WhatsApp and other Facebook companies.

The fine comes weeks after Amazon.com Inc. was hit with a record 746 million-euro penalty in Luxembourg, where it has its European base, for processing personal data in violation of the EU’s General Data Protection Regulation.

Under the three-year-old GDPR law, authorities have powers to fine companies as much as 4% of their annual sales. The rules put watchdogs based in a company’s chosen EU hub in charge of supervising them. But the Irish regulator, which has at least 28 privacy probes open targeting tech giants such as Apple Inc. and Alphabet Inc.’s Google, has faced mounting criticism for taking too long to wrap up its cases. 

“We disagree with the decision today regarding the transparency we provided to people in 2018 and the penalties are entirely disproportionate,” a WhatsApp spokesperson said. “We will appeal this decision.”

Europe’s Data Law Is Broken, Departing Privacy Chief Warns

The Irish authority said that it would also order the messaging service to take remedial action to bring its data processing communication into compliance. This includes making it clearer how users can lodge a complaint with a supervisory authority.

WhatsApp announced in an Irish regulatory filing in November it set aside 77.5 million euros to pay potential fines from at least two probes by Ireland’s data-protection watchdog. 

An initial draft of the fining decision by the Irish watchdog had stumbled amid several objections by EU counterparts, including “the appropriateness of the envisaged corrective measures.”

Thursday’s fine also comes amid added pressure on WhatsApp over policy changes it announced in January. It was forced to delay the overhaul until May after a backlash from users and regulators over what data the messaging service collects and how it shares that information with its parent Facebook.

The European Data Protection Board, a panel of EU authorities, said in July that Facebook’s practices linked to WhatsApp data should be examined “as a matter of priority” by the Irish privacy watchdog. 

The Irish authority in turn said it would consider any regulatory follow-up where needed, but that its most advanced WhatsApp probe had already included “an in-depth inquiry into WhatsApp’s privacy policy.”

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