How do I resolve "LegacyServerError: Invalid request parameters." error when trying to log in?

When I click "Sign In" after filling my email, secret key, and master password into the form located at, I get the following error:

I'm using latest version of Chrome.

1Password Version: Not Provided
Extension Version: Not Provided
OS Version: Not Provided
Sync Type: Not Provided
Referrer: forum-search:legacyservererror


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