As you may have noticed, twitter has decided to nuke it’s free APIs. While I have not seen for certain if oAuth services are included, it makes sense now more than ever to port your accounts over to an email based account.
Please go to the account dropdown -> settings and assign an email address to your account. Then set your password or do a password reset, whatever the case. After doing so, the twitter login will no longer work.
As a reminder – email verification is only used when you sign up and reset your password or email address. The world has too many emails already!