ERR_NGROK_1017: Accounts in bad standing may only switch to a free plan or update their payment method - ngrok documentation

What does ERR_NGROK_1017 mean?

ngrok returns ERR_NGROK_1017 with this message:

Accounts in bad standing may only switch to a free plan or update their payment method.

Where can I get more help with ERR_NGROK_1017?

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