Request is missing required authentication credential. Expected OAuth 2 access token, login cookie or other valid authentication credential

[ma zhiwei]

Hi,

I am using google ads api to get adwords data, but I got an error when I execute the code.

```

$oAuth2Credential = (new OAuth2TokenBuilder())->fromFile("google_ads_php.ini")->build();

// OAuth2 credentials above.

$googleAdsClient = (new GoogleAdsClientBuilder())->fromFile("google_ads_php.ini")

->withOAuth2Credential($oAuth2Credential)

->build();

$googleAdsServiceClient = $googleAdsClient->getGoogleAdsServiceClient();

$customerServiceClient = $googleAdsClient->getCustomerServiceClient();

// Issues a request for listing all accessible customers.

$accessibleCustomers = $customerServiceClient->listAccessibleCustomers();

print 'Total results: ' . count($accessibleCustomers->getResourceNames()) . PHP_EOL;

```

Error:

```

{ "message": "Request is missing required authentication credential. Expected OAuth 2 access token, login cookie or other valid authentication credential. See https:\/\/developers.google.com\/identity\/sign-in\/web\/devconsole-project.", "code": 16, "status": "UNAUTHENTICATED", "details": [ { "@type": "google.ads.googleads.v6.errors.googleadsfailure-bin", "data": "<Unknown Binary Data>" }, { "@type": "grpc-status-details-bin", "data": "<Unknown Binary Data>" }, { "@type": "request-id", "data": "feAcN0Pr2ap5iWrpDaC-rA" } ] }

```

After learning, someone said that it could be the wrong refresh token, but I can use the refresh token  to refresh access token.  

How can I solve it?

[Google Ads API Forum Advisor Prod]

Hello,

Can you please send the full API request and response logs through reply privately so I can take a closer look?

Thanks,
Anthony

Anthony Google Ads API Team

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