The EU has told Meta it has breached its rules by blocking other rival AI firms' chatbots from WhatsApp, and must make "urgent" changes.
The tech giant changed the popular messaging app on 15 January - and since then only its AI assistant Meta AI can access it.
But the European Commission said WhatsApp was an "important entry point" for AI chatbots like ChatGPT to reach people, and claimed Meta was abusing its dominant position by blocking them.
A Meta spokesperson told the BBC the EU had "no reason" to intervene, and claimed it had "incorrectly" assumed WhatsApp Business was a key way that people use chatbots.
"We must protect effective competition in this vibrant field, which means we cannot allow dominant tech companies to illegally leverage their dominance to give themselves an unfair advantage," said Teresa Ribera, the European Commission's competition chief.
