ERR_NGROK_SHIP_INTEGRATION_CREDENTIAL_REQUIRED: Provider PROVIDERID needs a credential - ngrok documentation

What does ERR_NGROK_SHIP_INTEGRATION_CREDENTIAL_REQUIRED mean?

ngrok returns ERR_NGROK_SHIP_INTEGRATION_CREDENTIAL_REQUIRED with this message:

Provider <PROVIDERID> needs a credential. Send <EXPECTED>.

Where can I get more help with ERR_NGROK_SHIP_INTEGRATION_CREDENTIAL_REQUIRED?

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