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I'm having the same issue and support just told me to do the same thing over and over again. I myself have put a lot of time and money into warframe and now I can't even play it. I've been having issues since harrow released and they removed like 20GB from the installation.

[Still having login issues since Harrow released.]

Warframe support just keeps giving me troubleshooting that I've done multiple times and doesn't even help me with my issue. Anyone found a fix for this?

[Says I need an update, start the updater, no update and can't login]

1 hour ago, (Xbox One)ziiNero said:

Same here I can't login half the time but when I do I get that message telling me there's a new update. My game work fine before the harrow update. 

Yeah I think it has something to do with the clean up they did removing like 20GB

[Says I need an update, start the updater, no update and can't login]

I was playing the game just fine then go to start another mission and I get a message saying there's an updated version of warframe. So I close the game and start it back up, no update then fails to login repeatedly. This is the second time it's done this, the first time I uninstalled the game and reinstalled it and it worked fine till now.