To take any actions on an order with Ordoro 3 you should use the Orders v3 API. This includes adding tracking to an order. Note: the base url is temporarily different for v3 orders.
You can update to /order/1-1001-1/shipping_info. Here is the documentation for that. POST shipping_info.
If you are using Ordoro 3, the v2 shipments endpoints may cause your v3 orders to behave in incorrect ways. Status updates and calculations are only supported with v3 Orders API.
We have recently found that some API users are not using the correct API, thereby causing their accounts to be in various invalid states.
This has been the case for quite some time, but we have only recently begun enforcing it.