I found a partial workaround. If you remove the account from online accounts and then reboot. Then you can successfully re-add the account. The account will work until you log out again. Then you will need to remove/reboot.
I think there might be a problem with how accounts are stored. This wasn't an issue in 16.04 so I'm pretty sure it's a new bug added with 16.10. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-online-accounts in Ubuntu. https://bugs.launchpad.net/bugs/1610944 Title: Can't add any online accounts Status in gnome-online-accounts package in Ubuntu: Confirmed Bug description: Can't add any online accounts in after opened Online accounts + mark is faded, can't click. After reinstalled gnome-online-accounts still has same problem. ProblemType: Bug DistroRelease: Ubuntu 16.10 Package: gnome-online-accounts 3.20.3-1 ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15 Uname: Linux 4.4.0-34-generic x86_64 ApportVersion: 2.20.3-0ubuntu5 Architecture: amd64 CurrentDesktop: Budgie:GNOME Date: Mon Aug 8 15:33:45 2016 SourcePackage: gnome-online-accounts UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-online-accounts/+bug/1610944/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : firstname.lastname@example.org Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp