Same problem here, have been getting "error":"invalid_request" responses on 
RefreshAccessToken requests starting early yesterday.  They happen 
frequently, but usually one or more retries succeeds in getting an access 
token.

We're on v201607 using the same OAuth2 credentials we've been using for 
months with no changes on our side.  Seems pretty clear this is an issue on 
the Google side of things.

{
  "error" : "invalid_request"
}
#0 
/opt/lothric/third-party-php/adwords-examples-and-lib-10.1.0/lib/Google/Api/Ads/Common/Util/SimpleOAuth2Handler.php(96):
 SimpleOAuth2Handler->MakeRequest('https://account...', Array)
#1 
/opt/lothric/third-party-php/adwords-examples-and-lib-10.1.0/lib/Google/Api/Ads/Common/Util/OAuth2Handler.php(116):
 SimpleOAuth2Handler->RefreshAccessToken(Array)
#2 
/opt/lothric/third-party-php/adwords-examples-and-lib-10.1.0/lib/Google/Api/Ads/Common/Lib/AdsSoapClient.php(452):
 OAuth2Handler->GetOrRefreshAccessToken(Array)
#3 
/opt/lothric/third-party-php/adwords-examples-and-lib-10.1.0/lib/Google/Api/Ads/Common/Lib/AdsSoapClient.php(199):
 AdsSoapClient->GenerateHttpHeaders()
#4 
/opt/lothric/third-party-php/adwords-examples-and-lib-10.1.0/lib/Google/Api/Ads/AdWords/Lib/AdWordsSoapClient.php(86):
 AdsSoapClient->__soapCall('mutate', Array)


On Wednesday, August 31, 2016 at 9:50:28 AM UTC-7, Mark Rogoyski wrote:
>
> We have also been getting the "error : invalid_request" error message 
> intermittently 
> since 11:33 PDT 2016-08-30.
>
> In the stats report log, we also see these errors occurring:
>
> Response Code: 500
> Error Message: Report download failed. Underlying errors are
> Type = 'ReportDownloadError.ERROR_GETTING_RESPONSE_FROM_BACKEND', Trigger 
> = 'Unable to read report data', FieldPath = ''.
>
> Response Code: 500
> Error Message: Report download failed. Underlying errors are
> Type = 'ReportDownloadError.INTERNAL_SERVER_ERROR', Trigger = 'Unexpected 
> Internal Server Error', FieldPath = ''.
>
> We are on v201605 of the API.
>
> On Wednesday, August 31, 2016 at 9:26:14 AM UTC-7, Li Tan wrote:
>>
>> I upgraded to v201607 and got the same error. 
>>
>> On Wednesday, August 31, 2016 at 8:11:50 AM UTC-7, Li Tan wrote:
>>>
>>> Same problem here.
>>>
>>> It started happening yesterday.
>>>
>>>  Still not working. (I reset the client secret, and regen the refresh 
>>> token.)
>>>
>>>

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