ERR_NGROK_4416: Your email does not match the email intended for this invitation, EMAIL - ngrok documentation

What does ERR_NGROK_4416 mean?

ngrok returns ERR_NGROK_4416 with this message:

Your email does not match the email intended for this invitation, <EMAIL>.

Where can I get more help with ERR_NGROK_4416?

Email support@ngrok.com and include the error code.