Might have slightly been patched, but like usual it didn't really do much just slightly change things and still works with the error message got it a few times just couldn't remember what I did other than what I say in a second,
do things that normally screw with the ps4 EG change time, language, toggle network on and off (not all at once per-say although it may work but just try different things) if anything they've basically made more things possible from the patch, (only tried to toggle internet) but I'm 100% certain that didn't work when I tried the original post
you can now just use one controller switch accounts while being inside a game/lobby on world war 2, go to network settings disable internet connection, re-enable open up ww2 and boom different account, (no error message most of the time just straight away says connecting to server ect) would be a lot more ways to do it I'm sure I didn't spend too much time finding any of these methods
will add this edit to the main post as well, they probably didn't even mean to mess with it but it is a bit dodgy of how quickly it stopped working.
worth looking into it if you are one to look for glitches, as they might've seen something that could go even worse than expected and tried to make a quick patch and failed. I just haven't been in the glitching scene since black ops 2 and even then not as much as earlier. so not exactly sure if I will end up looking too much further into it but if I get spare time I'll try different methods and try to create more of my own methods again (not really sure if the original method was already found) credits to whoever found if they did but just looking to help and doesn't look like anyone even thought it was possible not hunting for credit anyway just ps4 deserves everything good be it a game breaking glitch or the least glitchy we make a fine balance here at ps4
sorry for making this really long but if you're interested it is probably worth knowing not really sure if this make sense yet been up for about 32 hours