Following are some common issues when setting up the Google client ID.

Error: 400. That’s an error.
origin_mismatch

Solution:
You are entering the incorrect application URL.
- The URL you typed in the browser with which you are accessing Celoxis, is not the one you have entered when creating the Google client.
  OR
- You have not entered the correct application URL when creating the Google client. Change this to match the URL with which you access Celoxis.
Error: Invalid_client.
no application name

Solution:
This happens because you are using an existing project which does not have a Product Name entered. To resolve:
1. Go to the Google Developers Console.
2. Select the project you created.
3. From the sidebar on the left, select APIs & auth.
4. Under this, click on the Consent screen.
5. Select the Email address for your account.
6. Under Product name enter a product name/name of the project.
7. Click on Save.

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