The regulator is the lead supervisory authority for the company in the EU, meaning that it co-ordinates investigations into the business on behalf of the other member states. At this point it has not launched a formal privacy probe.
Amazon declined to comment.
But a spokesman for the National Data Protection Commission (CNPD) said that citizens could "file a compliant with our authority or his/her national supervisory authority" if they had concerns. "Unfortunately, at this stage, we cannot comment further about this case as we are bound by the obligation of professional secrecy," he added.
Concern about Alexa recordings came to light in April after the news agency Bloomberg spoke to staff who had transcribed clips for the firm. It said the recordings had sometimes been triggered by Amazon's smart speakers mishearing the command that is supposed to restrict when audio is transmitted back to the firm. It reported they had included everyday conversations as well as instances of suspected sexual assault.
