Hello Feet, sorry for the delayed answer.
Unfortunately we do not provide specific support for Linux (desktop) - please see Helix TV minimum requirements here: https://videotron.com/en/support/helix/apps/helix/download
Regarding that issue in particular, you may have to enable geolocation and cookies in your browser and make sure there isn't a particular setting or app routing the traffic and making you appear like connected from the United States (VPN, addons). You can easily check your IP online to see what websites are detecting.
Thanks for your understanding, have a nice evening. -Berenger