I am, and the error message is super misleading. "Check your login info" suggests that I somehow got my login information wrong, except I know that's not possible because I use a password manager and copy->paste my password for warframe, meaning that if I get a "check your login info" message, I think someone has stolen my account and changed the password.
That's not what happened, because I can log in with my proper credentials here on the forums. Instead, it's bad network connectivity because of server failures or maybe a DDOS attack. The game cannot authenticate my credentials over the network because of this, not "my login info is wrong".
DE should really change that error message to be more expressive. As for game access, we're all going to have to be patient as DE works through whatever issue(s) they're having.