USCIS has published a revised version of Form G-28, Notice of Entry of Appearance as Attorney or Accredited Representative, with an edition date of 09/17/18. This revised version removes the geographic requirement for sending an original notice to a U.S. address for attorneys and representatives that had been added to the 05/05/16 and 05/23/18 versions of the form.
USCIS is also extending the grace period for prior versions of Form G-28. You may continue to use the 05/05/16 and 03/04/15 versions of the form until Nov. 19, 2018. Starting Nov. 19, 2018, USCIS will only accept a Form G-28 with edition date 09/17/18 or 05/23/18. You can find the edition date at the bottom of the page on the form and instructions.