ERR_NGROK_27712: A provider with provider_id "PROVIDERID" already exists for this account - ngrok documentation

What does ERR_NGROK_27712 mean?

ngrok returns ERR_NGROK_27712 with this message:

A provider with provider_id "<PROVIDERID>" already exists for this account.

Where can I get more help with ERR_NGROK_27712?

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