Hi Srinath,

Sorry you're locked out. That specific message — "Unable to signup… sign in here to access your existing accounts" — usually means your account already exists, so the site is bouncing you because it's treating this as a new sign‑up instead of a login. Since you were able to use it yesterday, a few things commonly fix this (beyond incognito/other browsers, which you've already tried):

1. Use the exact sign‑in method you originally used. Free Edition supports only email OTP, Sign in with Google, or Sign in with Microsoft. As your account is a Gmail address, you most likely signed up with Sign in with Google — click that button (not the email sign‑up flow), and use the "sign in here" link in the error message, which routes to existing accounts, rather than an old bookmarked tab.
2. Allow third‑party cookies / relax tracking protection. A very common cause of "worked yesterday, blocked today" is the browser blocking cookies between the Databricks login domain and your workspace domain. On Chrome/Edge, allow third‑party cookies (or add a site exception) and disable privacy/ad‑blocking extensions for Databricks; on Safari, temporarily turn off Prevent cross‑site tracking. Then retry in a fresh browser profile.
3. Start from the official Free Edition sign‑in page (not a saved tab/link from yesterday) and enter the same email exactly.

If none of that works, this is most likely an account/provisioning issue on Databricks' side, which only Databricks can unblock — the community can't restore accounts. I'd open a request with Databricks support / the Help Center and include: the email used, the exact error text, roughly when it started, and your region. Tagging a moderator here also helps so they can flag it.

Hope you're back in soon!