This isn't Enpass; it's on the website.
The email field on the new login page, which uses a contemporary JS form (probably React), does not expose a correct name, id, or autocomplete for password managers. The email box is ignored and "save webform" never appears because Enpass recognizes the password input (hence the generator) but never considers the page to be a legitimate login form.
If the DOM is dynamically hydrated, shadow-DOM, iframe, or non-standard, renaming fields in Enpass won't help. This page lacks the fundamental accessibility semantics that autofill depends on.
In summary, you are not missing anything. Enpass is unable to reliably autofill here until the website corrects its HTML. Currently, the only option is manual login.