That indicates that that user is also using voice chat. Note that even if your account is already age-verified, you'll have to manually enable Spatial Voice Chat, as it is disabled by default.

How to Use Roblox Voice Chat Without ID Let’s make one thing perfectly clear: if your Roblox account isn’t 13+, you won’t be able to use this method. If it isn’t, you’ll have to wait ...

The latest announcement from Roblox confirms that there will be a mandatory age verification on the platform for all users, regardless of age. Text and voice chats on the platform will temporarily be ...

The verification process will use a combination of facial recognition tech, ID verification, and parental consent.

Roblox announces it will be implementing a new "safe" voice chat system in a presentation via YouTube for investors in the corporation.