Looks like they use a 2+3 config.
Makes sense.
They rebooked my wife (on an Aeroplan ticket) on the other side.
As to my booking, they only could assign me seats on non-AC codeshares. Somehow they were unable to assign me seats on TAP flights booked as codeshare.
Suggested I call AC. I am skeptical. Although I might try.
The TAP site redirects to checkmytrip.com when trying to mamage one's booking. For these flights booked as codeshares, I could not get myself a seat assignment either.