How do I set up 2FA on more than one phone?

How do I add Shopify in Google Authenticator on a second mobile device? While in Shopify I no longer see the QR code used to originally set up 2FA. In Amazon, I was able to simply click “add another app” to get the QR code so my business partner also has access to the 2FA and doesn’t have to call me every time he can’t get in. Amazon made it easy, so I assume Shopify would be easy also. Alas, not so easy. Please help.