COD Modern Warfare Online not possible?

If I want to play the new COD Modern Warfare, I can't connect to the online services. There's then "access to online services not possible". But I get into every other online game (like FIFA 20 and Fortnite). What do I have to do to play COD?

I already started the game yesterday and it was fine. A friend of mine, however, enters the game and the game is on the latest version.

I play on Ps

Internet check?

Check the speed of the line?

Game completely installed?

Restarted router?

Console also has network connection?

EA server may simply be overwhelmed?

Bought PS Plus?

Is the plus membership still running?

If it still does not work in a few days, reinstall the game?