Microsoft has an app called ‘microsoft visio’. This is a different visio. That’s what they’re asking. But the visio stands for “visioconférence” which is their word for videoconference. Many people in France just say “I have a visio” when they have to use one of these apps, regardless of which one they use. So op is asking about a potential trademark infringement but I really don’t think it’s gonna be an issue because it’s such a common word.