ERR_NGROK_SHIP_GITHUB_INSTALLATION_NOT_ALLOWED: Your GitHub user cannot see GitHub installation INSTALLATIONID - ngrok documentation

What does ERR_NGROK_SHIP_GITHUB_INSTALLATION_NOT_ALLOWED mean?

ngrok returns ERR_NGROK_SHIP_GITHUB_INSTALLATION_NOT_ALLOWED with this message:

Your GitHub user cannot see GitHub installation <INSTALLATIONID>. Configure the ngrok GitHub app's access, or reconnect GitHub.

Where can I get more help with ERR_NGROK_SHIP_GITHUB_INSTALLATION_NOT_ALLOWED?

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