Wrong email or password

• Check caps lock and typos
• Use the email you registered with
• Reset password via Settings if already signed in on another device

2FA code rejected

• Use the current 6-digit code — codes rotate every 30 seconds
• Ensure phone time is set automatically (TOTP depends on correct time)
• Re-add the account in your authenticator if you reinstalled the app

Still stuck

Email legal@sendbylaw.com from your account email with a description of the issue.