How do you approve another device

View and manage your trusted devices

You can view and manage a list of your trusted devices in the Devices section of your Apple ID account page.

1. Go to your Apple ID account page.
2. Sign in with your Apple ID.
3. Go to the Devices section.

The device list shows the devices that you're currently signed in to with your Apple ID. Select a device to view the model, serial number, and other useful information, including whether or not the device is trusted and can be used to receive Apple ID verification codes.

You can also remove a trusted device. Removing a trusted device will ensure that it can no longer display verification codes and that access to iCloud, and other Apple services on the device, is blocked until you sign in again with two-factor authentication. If you need to find or erase your device before you remove it from your trusted device list, you can use Find My iPhone.

Two-factor authentication for Apple ID - Apple Support

This did not allow me to approve the devices

You bought from Apple believing that it just works.

Did you get a response? My computer wants me to approve it from another device . . . or reset my keychain. What did I do to deserve this??????