On iOS you can now set it up so you use it from 1Password and not just your Keychain.
It’s easy to set this up so you know you can go to 1Password as a first option in all your applications.
To activate this
Settings -> Passwords and Accounts -> Autofill Password -> Turn on Autofill -> Select 1Password
Then whenever you get prompted for a password you can get this from your 1Password vault.