Unable to Sign Up "Invalid email address"

I’m unable to Sign Up to netlify.com using my (perfectly valid and active) email address. It’s the very same email address that I did use (successfully) to sign up to these very forums… but it won’t work on the main site! Fixing it would be greatly appreciated.

I don’t see any users with this email address (one used for your forum account). Would you please try creating an account again, making sure any browser add-ons or extensions are disabled? (Or, possibly, instead using a different web browser?)

If this doesn’t work, I would be happy to try creating an account using that email address. Obviously, the password would be unknown but, if it works, then account will exist at which point the password reset email could be used to get access.