I recently deleted the Destiny 2 Companion app on my phone. When I redownloaded it, when I tried to sign in with the PlayStation Network, it came up with 'Authentication Error' and the error code was 'Unknown.' The first time I had downloaded the companion, it worked fine. Even when I tried to register with the Charlemagne Bot, it didn't let me sign in. I'm new to these forums, so if this issue has already been addressed, I would appreciate if you just sent a link to the initial forums post.