All my passwords to web accounts disappeared. How do I get them back?

Hello Kskbk,

Thanks for reaching out through the Apple Support Communities about your saved passwords no longer appearing on your iPhone.

Do you have the iCloud Keychain feature enabled? Set up iCloud Keychain

If so, are your saved passwords appearing on any other devices?

The following resource also has some steps that may help: If iCloud Keychain won't turn on or sync

Should that behavior still continue, you’ll want to reach out to Apple Support so they can look into this further: Contact Apple Support

Take care.