You have cross save enabled with Steam as the primary cross save account. Since D1 never existed on PC that Steam account cannot have veteran rewards and dialogue. The veteran items are linked/locked to the characters of the account that earned them. So if you qualified on XBox or PSN they were would be on those characters. So the only way to see those items is to either make XBox or PSN your main cross save account or completely disable cross save and play XBox and PSN on their own. Cross save does not share in-game items between accounts so there is no way to get veteran items to show up on Steam characters.