Login information won't fill for either the internal browser or share to Safari on iOS.
A neighbor friend reported this wrt his Andriod 1Password, and I seem to have the same trouble on iOS.
I'm using version 7.0.4 - don't know his version.
1Password Version: 7.0.4 (iOS)
Extension Version: Not Provided
OS Version: iOS 11.2.2
Sync Type: Not Provided