Bethesda said in a statement that you will need an internet connection even if you play the game alone.
It may seem strange that even when you buy a game only for the story mode, it requires an internet connection. Even though our game devices are always connected to the internet, it can be frustrating to spend our quota for such productions.
It will not be possible to play Redfall without internet
Bethesda clarified that the game will always require an internet connection, stating in its updated Redfall FAQ, “A persistent online connection is required for singleplayer and co-op.” Internet access is not always possible. Sometimes quota internet and sometimes insufficient internet level in the region seem to be the biggest obstacle in front of this game.
The company does not make the game difficult to access only by obliging the internet. You will also need a Bethesda.net account if you want to link the game to your Xbox profile. Although Microsoft has bought the company, it seems that the integration has not yet been fully established.
Also, this brings up another problem. The game you purchased requires the servers to be always up. Some players continue to play the same game even after many years have passed. If the day comes and the company decides to pull the plug on the production, it will both take away your enjoyment of the game and prevent you from reaching the production you paid for. In addition, the shutdown of the server in cases such as maintenance, updates, etc. also shows that you may not be able to enter the game at any time.