Hi, Thanks for posting in Google help forums,
If the Account / Accounts are exported or not exported,
Once you select " Next "and go back without scanning barcode,
You can see this Notification " Accounts were recently exported", in this window,
https://photos.app.goo.gl/Yg3LWwBBqg3PVrEt7For Clear this Notification ,
Or disable the exported codes ( in case),
You need to remove Account / Accounts From Authenticator app and Add back Accounts in the same method How you did before,
When adding back,
Use New Set of 32 digit code or Scan New barcode,
Next,
Open Google Authenticator from the Home screen,
Follow the instructions and Remove Account,
https://photos.app.goo.gl/SSVJqQSS2D3RH1Xi9Next,
Open the link,
Select this Account,
https://myaccount.google.com/securityGo to 2 - Step Verification On ,
Sign in,
Next Window,
Scroll down and Select Authenticator App and Follow the instructions, and add Accounts ,
https://photos.app.goo.gl/mNphtTZAj2oJAwpDAGoogle Authenticator codes associated with THIS Accounts in / From All other Device or Devices should be disabled and be enabled in this Device only.
Last edited 9/19/20