App passwords won't save to iphone

ltonozzi wrote:

Some passwords saved for apps will not save in my iphone. I have turned the auto-fill and the iCloud keychain off and on.

Did you sign out of iCloud and back in—to jump start sync—sign back in

Sign out of iCloud on your iPhone, iPad, iPod touch, Apple TV ...

If iCloud Keychain won't turn on or sync

I had that problem awhile ago but it was when Norton Password was saving my passwords ahead of the iPhone. Just an idea for you to check out. Good luck.