How can I report a bug? | Meta Business Help Center - Facebook
If the home page is physically broken or you are certain your credentials are correct, you need to flag it. For Individual Users: report a login issue home page facebook work
The page won’t load, or the "Log In" button is unresponsive. How can I report a bug
Facebook will offer one or more contact methods (email or SMS). Select one and click . report a login issue home page facebook work
To summarize, the specific button does not exist as a standalone feature. However, the functional pathway does exist. You must use the "Forgotten account?" link as a trojan horse to access the hidden support forms.
Alex (QA Engineer) Environment: