The operation POST /environments/{envID}/users/{userID}/devices with required header Content-type: application/vnd.pingidentity.devices.reorder+json explicitly orders a user’s active devices according to the request body. The device listed first becomes the default device.

After you set the device order, subsequently activated devices are appended to the end of the order list. You can reorder devices with this operation as many times as needed.

For more information, see Setting device order.