Microsoft Authenticator

@Frank15740 

I think this is what you are asking for. Please forgive me if I am wrong. 

1. 1Password account.
2. Person A and Person B want to have code generators on each of their devices? Enabling you either one to have the code if needed. 

You would need to set up two-factor authentication at the same time with both devices scanning the same QR code. If both devices scan the same setup code, you should see the same two-factor authentication 6 digit code on both devices. 

To do this properly, you will likely need to disable two-factor authentication on the desired account and then set it up again. During set up, when the QR code is presented, scan it with the 1st Authenticator app and save the entry on the device. Scan the same QR code with the other 2nd Authenticator app. Save the entry on that device.

 Make sure the displayed codes match between the devices. At the confirmation prompt on the site, enter the code to verify you have successfully saved it. Save any backup codes if the site provides them.

 * Do not go to the confirmation page on the site until you have scanned and saved your entries on both devices. If you proceed forward after scanning one device, the QR code will disappear, and you'll need to start all over again.