Steps to reproduce:

1. setup VM with private address, try to configure Gmail with simple email account without using application passwords, like it can be done in a single click style on Synology, Jira and many-many other apps.
2. it's not clear for Gmail users (not Google Cloud) accounts where to find client id from the user perspective.

Result:

Expected:
Advanced mode and simple mode which works for common Gmail/Office365 users without requirements to find client id in a Google Cloud account even for private range of IP-addresses, like it's done on Synology, QNAP, Jira, etc...