Form completion are working fine for username/email and passwords, but unlinke Safari, it does not complete One Time Code, making it a chore to open up passwords every time it is asked. At least that is the observed behaviour in Microsoft Login, not sure it is related to the browser/system language, which in my case is portuguese.
I would guess that it would be in the same way the email and password suggestion are implemented, seems to be a matter of querying for an input with OTC and suggest.
This feature is implemented in Safari, using the system Keys; I just have to autenticate myself, through fingerprint for instance, to enable its completion from the database.
With that in place, we no longer have to waste time going to Passwords and copying the Code to use it, and no more hurry if the password is about to expire, which isn't indicated in the User Interface which is indicated in the UI only if you click in a WebSite's password entry.