Came across this one a short while back, quite an easy fix. When you logon to certain websites. Google Chrome doesn’t prompt you to save the password. Basically it’s on an “exclusion” list. This is how you resolve it.
In Google Chrome, click the 3 dots, go to “Settings”, go to the field called Passwords and click on it (under the Autofill section)
Now type a few letters from the Website address into the search bar at the top.
You will (or probably) will find the website name appear under the section called “Never saved”.
All you need to do to fix this is just click on the X to delete the entry (I’d recommend deleting them all for that site)
If you then go to logon the site again, you should then receive a prompt to save the information