Manual masked email (again)

I will take part in this, if you don't mind. (the forwarding of pages that don't work with triggering masked password suggestions.)

I have found the failure of this feature rather irritating, because there's a big gap between the functionality I've experienced and the shiny marketing page here:
https://1password.com/fastmail/
that says:

Easily create email addresses on the fly

Create a new masked email address without ever leaving the sign-up page. Now, keeping your email anonymous is as easy as generating a strong password.

This was a MASSIVE part of why I chose to part with my money for an annual subscription, and it frequently doesn't work. Also, when it does work, I still have to go to Fastmail and browse to the Masked Emails section to add a note to the newly created masked email about what it's for.

...The marketing claim is probably technically correct though, as it says "as easy as generating a strong password" - which is next to impossible on my Android device, the only way to do that with 1Password is via creating a new login item, then copying the password, and deleting the login item. But that's a whole different kettle of annoyance...