Keep getting a "Daily Limit for Unauthenticated Use Exceeded. Continued use requires signup" when attempting to google plus login on my web app

I too ran into the same error - "Daily Limit for Unauthenticated Use Exceeded. Continued use requires signup".

I went and checked my google developer console under APIs for the project associated with the API key/ auth key, eg, https://console.developers.google.com/project/<your app id>/apiui/api. The status for Google+API was set to OFF. I turned it ON.

I then got another access token, and then tried with the new one. It worked, ie, the error was gone and I got the profile details. To cross-check if that was indeed the cause of the error, I went back to console and disabled Google+ API. But now, I get the error:

"Access Not Configured. Please use Google Developers Console to activate the API for your project."

So, I am not 100% sure that it was the turning on/off of the Google+ API in my developer console, but do ensure that this is turned on. Also, wait a few minutes after turning on, and ensure that you get a fresh token each time before trying it.

This issue happens when you are already logged in and still try to login again and again. I faced same error so did some experiments 1) I opened website on my mobile and everything was fine. 2) Then i tried on another laptop and used different gmail account to login and it again worked fine. 3) On my first laptop i tied again by clicking "Signin" button i got same error, so i opened google.com then logged out completely and then tried again, this time it worked. So i believe, Issue is clicking login button again and again without logout.

I am not sure if this is a really a issue, but atleast this is what i found. I am still trying, trying and trying , will post if i found anything else.

Cheers !!

Make sure you have Google+ Api here enabled.

Without it you will get errors like:

"domain": "usageLimits","reason": "dailyLimitExceededUnreg","message": "Daily Limit for Unauthenticated Use Exceeded. Continued use requires signup.",

To enable it:

1) open https://console.developers.google.com

2) choose your project (top right corner)

3) search for "Google+ API" in search box and enable it if it is not enabled already.