Accidentally clicked "never" when asked to save password in Safari. Do want password saved.
- Settings > Safari > Clear History and Website Data
- Settings > Passwords & Accounts > Website & App Passwords > (scroll down to/type in website) > (delete the website)
- Open Safari and type in website
- Enter login
- When asked, select "Save Password"
It only took me about a year of searching these posts with no help to finally figure this out. :)