You've got Circle set up, and you've assigned your devices to profiles. Your devices are being used but you're not seeing the correct Usage or History for them?
How Does Circle track Usage/History?
When you first set up Circle you pair it with your network. This allows it to communicate throughout the network with other devices through your router. It then identifies those devices by their MAC address (a unique set of letters and numbers computers use to identify each other) and their hostname (a human-readable identity that you or the device manufacturer set up) that is communicated over the network. Circle then listens to your network for Internet activity and manages that traffic. When you set up profiles and assign devices you are telling Circle what devices to listen to, and how to treat them. If Circle can't hear those devices on your network, because of how they are configured or because they are misidentified in the Circle app, it won't show the Usage/History for them.
Which device is which?
Sometimes missing Usage/History happens because a device isn't assigned to the right profile. You'll want to make sure you've assigned the device correctly. Check out this article for help identifying devices and make sure you've got those assigned to the correct profile. You can do so by identifying it via name or MAC address. (You can also go to mycircle.meetcircle.com while on your WiFi network at home to see the profile assignment.)
Look at the Filter level
Make sure the device is on a profile level of Adult or below. Devices assigned to a "None" or "Unmanaged" devices will not show History/Usage.
Check the network settings
Make sure the device(s) having this issue are connected to your home WiFi that Circle paired with and not another network. Keep in mind that Circle can only manage one network and won't track Usage/History of a device that is using data (unless you're using Circle Go), or on another network segment than Circle. Remove any network settings that would keep the device from being seen by Circle like connecting to a Guest Network or using a VPN. If the device is data capable turn off data to ensure that the device is not using this for its Internet connection.
Make sure the Circle device is tracking
Are none of your device tracking Usage/History? Check to make sure you have a compatible router. Try plugging Circle in via Ethernet directly to your router, and then reboot Circle (via the Circle app's Menu > Manage > Reboot Circle) and the router (by turning it off and on). This will make sure Circle is on, connected to your network, and able to see traffic consistently.