Google UrlShortener 403 Rate Limit Exceeded

suddenly as of 6pm yesterday I started getting a 403 from Google

{
"error": {
    "errors": [
        {
            "domain": "usageLimits",
            "reason": "rateLimitExceeded",
            "message": "Rate Limit Exceeded"
        }
    ],
    "code": 403,
    "message": "Rate Limit Exceeded"
}

}

100% of our requests are getting this error. I checked my rates and we are nowhere near the limit. This code has been in place for a year. Any ideas?

• Max for 100s over the last 24 hours is 40
• Total Requests for 24 hours is less than 2000

These are typical rates for us

Had the same issue but it seems to be working now. The URL shortner API is being deprecated. We had to implement FireBase as well.