I hit this same error last week and finally got past it. Sharing what worked, since the existing replies didn't cover this specific cause.
What worked for me:
- Used Edge in InPrivate / incognito mode (Chrome works too if you fully clear cookies first)
- Switched to a Gmail address without dots in the local part
The second one is the key. Gmail treats firstname.lastname@gmail.com and firstnamelastname@gmail.com as the same address โ both land in the same inbox. But it looks like Databricks' signup flow strips special characters and stores the result as a username - and this is an assumption. If you previously attempted to sign up with the dotted version, a "ghost" account exists for the stripped version too. Subsequent attempts then fail silently with the "Unable to sign up, please try again" error, because the system thinks the account is already half-created.
So: try the exact same signup with the dotless version of your Gmail (or a different Gmail entirely that hasn't touched Databricks). New private window, no VPN, mobile data if your home network has been giving issues.
Worked first try after several failed attempts on the dotted version. Hope this helps someone else hit by this.
