Cannot create new account (Primary email required error)

I am trying to create a separate, standalone Mozilla account using my work email address, but I am stuck in an account routing loop after deleting it as a secondary email from my personal account. I added my work email as a secondary email to my personal Mozilla account long time ago, 4 days ago deleted the secondary email from my personal account settings to register it as a separate account instead. Attempted to sign up at accounts.firefox.com, but the system automatically routes the email to the Sign In screen instead of the Sign Up screen. I encountered Error messages entering a password on the Sign-in screen displays: "Primary account email required for sign-in". Then requesting a password reset displays: "Unknown account". Troubleshooting Already Tried: Tried signing up in Private/Incognito windows across multiple browsers (Firefox, Chrome). Waited over 72 hours for the system cache to clear, but the sign-in page still routes the address as an existing account. Can you please escalate this to the Mozilla Accounts operations team to clear or purge the stale secondary email mapping for work email in the sign-in lookup index. I will provide the email upon request