I was successful with the same family user on their new iPhone XR using the Scan Account Details option. But on this iPad with this version of 1password, everything seems to work ok including scanning the barcode and getting the proper Secret Key, but sign it fails with "Check Your Email and Secret Key". I have checked the secret key and also manually pasted in the Secret key, but no luck. I have restarted app and also iPad, no change in behavior.
1Password Version: 6.9.1
Extension Version: Not Provided
OS Version: 9.3.5
Sync Type: Not Provided