Blogger API calls failing with Bearer auth token recently.

I have an Android app which has been working all this while, until 
recently, when people started complaining about problems.

I have two auth methods. GoogleAuthUtils, and the browser OAuth2 flow. None 
of the tokens returned by these two methods work. Both of them give 401, 

Authentication error: Unable to respond to any of these challenges: 
{bearer=WWW-Authenticate: Bearer realm="https://accounts.google.com/", 
error=invalid_token}

Error Response: {
                                                                "error": {
                                                                 "errors": [
                                                                  {
                                                                  
 "domain": "global",
                                                                  
 "reason": "authError",
                                                                  
 "message": "Invalid Credentials",
                                                                  
 "locationType": "header",
                                                                  
 "location": "Authorization"
                                                                  }
                                                                 ],
                                                                 "code": 
401,
                                                                 "message": 
"Invalid Credentials"
                                                                }
                                                               }



And I haven't changed anything at all, not even the API Keys. Has something 
changed recently? However, the API explorer seems to be working fine, and I 
tried to check the request headers, and I am doing the same things.

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