[pmlnr]

Is it just me or is this somewhat a contradiction?

    "Your Workplace account is separate from your personal Facebook account."

https://workplace.fb.com/trust/

    How do I create a separate username and password for my Workplace account?

    To separate your personal account from your Workplace account:
    
        Go to your Security Settings and click Sign Up Manually
        Enter and confirm a New Password
        Click Unlink Account
    
    Note: Once your Facebook accounts are unlinked you'll have to log in separately to your Workplace account."

https://www.facebook.com/help/work/1581273578811546?helpref=...

[charlesdenault]

See other comments regarding employer being able to create an account via POST request. I'd assume that's the only way to create clean separation, even then I don't doubt they'll be able to fill in that gap!