Hi, I had the same problem a few weeks ago. My solution was to use the backup codes of the Google account to allow the review team to login no matter where they are located. For that, you have first to enable the Two-Factor Authentication on your test account, then communicate the Backup Codes to the reviewer within the Notes section (bellow the Sign-in information section) when you create a new release of your app. A backup code will allow the reviewer to skip the Two-Factor Authentication, but careful, each backup code can be used only once (so don't forget to update your list or generate new backup codes before submitting your update). Hoping it will help.