Hey! If keychain doesn't work, it's probably about your settings of keychain app.
I log in without problem with keychain.
Try to add more powerful key to your keychain app, for example.
I have my active key added to my keychain app. Tried to add yours into your keychain: "Menu - Account - Manage accounts". (I don't know, maybe the posting key is enough, I just shared a thought).
Thank you for your explanation. I will give it a try.