you may mark your case as SOLVED!
head over to this link: https://www.drivereasy.com/knowledge/origin-online-login-is-currently-unavailable-fixed/
and then just go straight to the step to update your time settings with windows server.
I could use origin pc client all good until win10 had it latest security update. after updating origin to the latest version, I ended up being stuck in offline mode. THIS IS THE FKN CURE!!!
ok i got it fixed now for some odd reason, i use a geforce GTX 1070 ti and downloaded the latest drivers today, since then origin started having issues, i've redownloaded and reinstalled that same driver now and suddenly origin works again, weird
Uninstall origin completely. Leave your games, just Origin.
Google search Origin Download. Use the filehippo link, should be build 10.5.41.27263
Download and install, go to settings and disable automatic game and Origin updates. Sign in and play
Do not exit origin or you will have to repeat.
Let me know how its goes. Good luck! Worked for me!