Had the same issue recently. You are in BC if the class is J. Don’t expect too much of copa business by the way. Short routes just offer a drink and a bag of cookies or crackers.

I was actually able to login to copa and pick seats myself. Well, the first time I was. The AF website then also showed those seats I picked. After picking though, the system did not let me change the seats - copa showing some random ‘unknown date’ error from that point onwards. I did fly in the seats I picked.

One additional thing to note is that copa and afkl don’t work very well together. On the return flight I had a 20+ hr layover, however copa was not able to short check my luggage as their systems don’t allow doing that on an afkl ticket. Or that’s what they told me anyway.