I migrated my 100's of Web logins from 1Password into Keychain yesterday ( quite a long process! ) using my Mac, and then tested it on my iPhone.
Then I tested it on my iPad by spot-checking logins that I had added.
Problem 1) none of them were there.
Fix: I fixed that by logging in/out of iCloud on my iPad. Afterwards, the newly added accounts were there.
Problem 2) I navigated to Macrumors and tested to see if it would prompt me to use the stored password. Nothing.
I navigated to Macrumors on my iPhone, and it prompted me to use the stored password.
The problem turned out to be that I was using a Smart keyboard with shortcuts disabled in Keyboard settings.
Fix: I turned shortcuts on and tested the login again. The shortcut bar appeared and prompted me to select which credentials I wanted to use to login.
WIN!
Then I tested it on my iPad by spot-checking logins that I had added.
Problem 1) none of them were there.
Fix: I fixed that by logging in/out of iCloud on my iPad. Afterwards, the newly added accounts were there.
Problem 2) I navigated to Macrumors and tested to see if it would prompt me to use the stored password. Nothing.
I navigated to Macrumors on my iPhone, and it prompted me to use the stored password.
The problem turned out to be that I was using a Smart keyboard with shortcuts disabled in Keyboard settings.
Fix: I turned shortcuts on and tested the login again. The shortcut bar appeared and prompted me to select which credentials I wanted to use to login.
WIN!