My client cannot use App for a month just because of this.
I have searched many but no such information, and I have blindly tried many. I am getting tired over frustrations.
Please anybody, please HELP.
Here's what I did:
- I built an app years ago. It had been working well until a few months ago. Issue started since then.
- It works in the primary account where I created the app with, but in my secondary account in the same organization, app never lets us use due to this issue (explaining below).
- App gives me 1 inconvenience and 1 issue(below). Both never happened a few months ago. Those are what I am asking solutions for.
1. Inconvenience: "App Permission" window pops up & keep asking to sign in whenever I launch the app in the secondary account

I refreshed my sharepoint lists and Flows connected to this app and saved, no luck. I granted each sharepoint lists EDIT permission to my secondary account. No luck.
I tried "Save As" to create as a new app, it works, but it starts asking to sign in to each connectors after days. It is ridiculous if I need to keep doing this, yes? 😞
2. Issue: In the "App Permissions" popup, Gmail connector asks ClientID and ClientSecret

Title explains it. When I click "Sign in" of Gmail connector in "App Permissions" popup, the above image pops up. I entered the clientID and secret I registered on my GoogleWorkspace's Cloud App, it gives me an error as below:

The error says "Server sent an invalid response for api call: IConnectionResponse"
I have been fighting this already a few months and am getting exhausted literally. My client cannot process the business so they work on it manually.
Could anybody help?? Even tiny hints or clues I am ready to search matter related to it.
Thank you so much in advance.