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"Error registering: Provider OAuth refresh token is empty. Maybe previous token wasn't properly revoked!"

To have a secured connection between InboxZero and your mailbox which is stored at your provider, your provider will provide an authorisation token to us to access your emails. 
At certain time intervals this token will be updated to keep a secured connection. In some cases it may occur, following a technical error, that your old token is blocking the creation of a new one. 
You'll then have to revoke your token manually following the procedure bellow, which depends on your provider: 

  • Gmail
  1. Go to
  2. Select InboxZero
  3. Delete the application
  • Yahoo: 
  1. Go to
  2. Select InboxZero
  3. Remove the application
  • Outlook: 

Microsoft actually don't allow to revoke manually an authorization token. Contact us at for personal assistance.