With the help of Tom from Esri Canada I think I have it figured out! I am now in Survey123!
"So I believe I've resolved the client_ID error message, this is because the default application you've generated is not actually part of ArcGIS Online yet, so there is no client_ID associated with it. To resolve this problem, follow the steps below:
- In AppStudio, on the Survey123 Template, select the Upload button.
- This may take several minutes
- Once uploaded, still within AppStudio, select Settings.
- This will open the settings for the Survey123 template
- In the AppStudio Settings menu, select Advanced...
- In the Advanced Settings menu, click on the Register button
This will generate a client_ID for your application within you ArcGIS Online Organization, allowing you to sign in properly through the viewer."