What worked for me was deleting some files from my computer that had been downloaded the same day Origin wouldn't let me log in. just type in uninstall program into your computer's search and uninstall what you don't want. BE CAREFUL YOU DON'T UNINSTALL A NECESSARY FILE!
For those still searching here is the TEMPORARY fix/workaround. Uninstall the Origin client. Then install an older version. Here is a link to a working version of the client:
https://origin-a.akamaihd.net/Origin-Client-Download/origin/live/OriginSetup_10_5_41_27263.exe
The only problem is, this works one time. Once you exit the client and relaunch it, it will check if there is a newer version of the client and force you to update it to the broken version. So you will have to uninstall and reinstall ... again.
@El-Barton67 has the link for the ONLY method that works to circumvent whatever error is keeping people from accessing online Origin. I tried every other "official" troubleshoot for this problem and nothing worked. For someone who is only having the issue of not being able to get online - do NOT clear your cache! Because then you will not be able to sign into Origin AT ALL because the "first sign in must be online". Just don't do it.
Uninstall Origin. Reinstall it from that link. And you'll be golden.
EA: Fix this! This is ridiculous. You're holding games hostage. And your support team? I've been waiting over an hour for help with this. This is bogus. Get your selves together! Yeesh.
