Make sure you added your website URI as an authorized origin in your Google API Console. Open your google developer console and navigate to your “Credentials” page. Click on a pencil icon to view/edit the client ID you are using in LatePoint:
If you have done all that and you are still getting an error message about unauthorized URI – try resetting your browser cache, as a lot of the times that might be an issue: https://stackoverflow.com/a/45761277/429649
And also it might take up to 24 hours for that information to be applied on Google Servers.