Today's earlier sign in issues on PS4 should be fixed now. If you're still seeing the 403 error, restart and try to sign in again. Thanks for your reports and for your patience!
I have a error every time I upload it will be stuck at 99 or 98 processing it stay's like that for around 5-10 minutes and then when I check back the video is still not there and I have to reupload it again and again until it fix's itself...