Hi team,

We are hitting a token access issue suddenly.
calling google ads hit this exception since UTC 2022-02-10.
Does anyone know how to resolve it?
[GetCustomers] ExternalServiceHelper.CallWithRetryAsync retry:0, 
<GetCustomerResult>b__0, 
Errors:["{\"Code\":\"UnknownError\",\"Property\":\"GetCustomers\",\"Message\":\"Grpc.Core.RpcException:
 
Status(StatusCode=\\\"Internal\\\", Detail=\\\"Error starting gRPC call. 
TokenResponseException: Error:\\\"invalid_grant\\\", Description:\\\"Bad 
Request\\\", Uri:\\\"\\\"\\\", 
DebugException=\\\"Google.Apis.Auth.OAuth2.Responses.TokenResponseException: 
Error:\\\"invalid_grant\\\", Description:\\\"Bad Request\\\", 
Uri:\\\"\\\"\\n
   at 
Google.Apis.Auth.OAuth2.Responses.TokenResponse.FromHttpResponseAsync(HttpResponseMessage
 
response, IClock clock, ILogger logger)\\n
   at 
Google.Apis.Auth.OAuth2.Requests.TokenRequestExtenstions.ExecuteAsync(TokenRequest
 
request, HttpClient httpClient, String tokenServerUrl, CancellationToken 
taskCancellationToken, IClock clock, ILogger logger)\\n
   at 
Google.Apis.Auth.OAuth2.Flows.AuthorizationCodeFlow.FetchTokenAsync(String 
userId, TokenRequest request, CancellationToken taskCancellationToken)\\n
   at 
Google.Apis.Auth.OAuth2.Flows.AuthorizationCodeFlow.FetchTokenAsync(String 
userId, TokenRequest request, CancellationToken taskCancellationToken)\\n
   at 
Google.Apis.Auth.OAuth2.Flows.AuthorizationCodeFlow.RefreshTokenAsync(String 
userId, String refreshToken, CancellationToken taskCancellationToken)\\n
   at 
Google.Apis.Auth.OAuth2.UserCredential.RefreshTokenAsync(CancellationToken 
taskCancellationToken)\\n
   at Google.Apis.Auth.OAuth2.TokenRefreshManager.RefreshTokenAsync()\\n
   at 
Google.Apis.Auth.OAuth2.TokenRefreshManager.GetAccessTokenForRequestAsync(CancellationToken
 
cancellationToken)\\n
   at 
Google.Apis.Auth.OAuth2.TokenRefreshManager.<GetAccessTokenForRequestAsync>g__LogException|10_0(Task
 
task)\\n
   at 
Google.Apis.Auth.OAuth2.UserCredential.GetAccessTokenWithHeadersForRequestAsync(String
 
authUri, CancellationToken cancellationToken)\\n
   at 
Grpc.Auth.GoogleAuthInterceptors.<>c__DisplayClass3_0.<<FromCredential>b__0>d.MoveNext()\\n
--- End of stack trace from previous location ---\\n
   at 
Grpc.Net.Client.Internal.GrpcProtocolHelpers.ReadCredentialMetadata(DefaultCallCredentialsConfigurator
 
configurator, GrpcChannel channel, HttpRequestMessage message, IMethod 
method, CallCredentials credentials)\\n
   at 
Grpc.Net.Client.Internal.GrpcCall`2.ReadCredentials(HttpRequestMessage 
request)\\n
   at Grpc.Net.Client.Internal.GrpcCall`2.RunCall(HttpRequestMessage 
request, Nullable`1 timeout)\\\")\\n
   at 
Google.Ads.Gax.Interceptors.UnaryRpcInterceptor.Intercept[T,TResponse](Task`1 
task, Action`1 callback)\\n
   at Grpc.Net.Client.Internal.GrpcCall`2.GetResponseHeadersCoreAsync()\\n
   at 
Google.Ads.Gax.Interceptors.UnaryRpcInterceptor.Intercept[T,TResponse](Task`1 
task, Action`1 callback)\\n
   at 
Google.Api.Gax.Grpc.ApiCall.GrpcCallAdapter`2.<>c__DisplayClass4_0.<<CallAsync>g__WaitAndCallHandlers|0>d.MoveNext()\\n
--- End of stack trace from previous location ---\\n
   at 
Google.Api.Gax.Grpc.ApiCallRetryExtensions.<>c__DisplayClass0_0`2.<<WithRetry>b__0>d.MoveNext()\\n
--- End of stack trace from previous location ---\\n
   at 
Google.Api.Gax.Grpc.ResponseAsyncEnumerable`3.ResponseAsyncEnumerator.MoveNextAsync()\\n
   at 
Microsoft.Ads.Mca.Implementation.AdsSync.Helper.GoogleSyncHelper.<>c__DisplayClass6_0.<<GetCustomerResult>b__0>d.MoveNext()\\n
--- End of stack trace from previous location ---\\n
   at 
Microsoft.Ads.Mca.Implementation.AdsSync.Helper.GoogleSyncHelper.<>c__DisplayClass6_0.<<GetCustomerResult>b__0>d.MoveNext()\\n
--- End of stack trace from previous location ---\\n
   at 
Microsoft.Ads.Mca.Common.Client.Common.ExternalServiceHelper.CallWithRetryAsync[T,V](Func`1
 
func, IExternalServiceExceptionHandler exceptionHandler, ILogShared logger, 
String property, ValueTuple`2 retryPolicy, V argumentsTuple)\"}"], Raw 
Exception Grpc.Core.RpcException : Grpc.Core.RpcException: 
Status(StatusCode="Internal", Detail="Error starting gRPC call. 
TokenResponseException: Error:"invalid_grant", Description:"Bad Request", 
Uri:""", 
DebugException="Google.Apis.Auth.OAuth2.Responses.TokenResponseException: 
Error:"invalid_grant", Description:"Bad Request", Uri:""
   at 
Google.Apis.Auth.OAuth2.Responses.TokenResponse.FromHttpResponseAsync(HttpResponseMessage
 
response, IClock clock, ILogger logger)
   at 
Google.Apis.Auth.OAuth2.Requests.TokenRequestExtenstions.ExecuteAsync(TokenRequest
 
request, HttpClient httpClient, String tokenServerUrl, CancellationToken 
taskCancellationToken, IClock clock, ILogger logger)
   at 
Google.Apis.Auth.OAuth2.Flows.AuthorizationCodeFlow.FetchTokenAsync(String 
userId, TokenRequest request, CancellationToken taskCancellationToken)
   at 
Google.Apis.Auth.OAuth2.Flows.AuthorizationCodeFlow.FetchTokenAsync(String 
userId, TokenRequest request, CancellationToken taskCancellationToken)
   at 
Google.Apis.Auth.OAuth2.Flows.AuthorizationCodeFlow.RefreshTokenAsync(String 
userId, String refreshToken, CancellationToken taskCancellationToken)
   at 
Google.Apis.Auth.OAuth2.UserCredential.RefreshTokenAsync(CancellationToken 
taskCancellationToken)
   at Google.Apis.Auth.OAuth2.TokenRefreshManager.RefreshTokenAsync()
   at 
Google.Apis.Auth.OAuth2.TokenRefreshManager.GetAccessTokenForRequestAsync(CancellationToken
 
cancellationToken)
   at 
Google.Apis.Auth.OAuth2.TokenRefreshManager.<GetAccessTokenForRequestAsync>g__LogException|10_0(Task
 
task)
   at 
Google.Apis.Auth.OAuth2.UserCredential.GetAccessTokenWithHeadersForRequestAsync(String
 
authUri, CancellationToken cancellationToken)
   at 
Grpc.Auth.GoogleAuthInterceptors.<>c__DisplayClass3_0.<<FromCredential>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at 
Grpc.Net.Client.Internal.GrpcProtocolHelpers.ReadCredentialMetadata(DefaultCallCredentialsConfigurator
 
configurator, GrpcChannel channel, HttpRequestMessage message, IMethod 
method, CallCredentials credentials)
   at 
Grpc.Net.Client.Internal.GrpcCall`2.ReadCredentials(HttpRequestMessage 
request)
   at Grpc.Net.Client.Internal.GrpcCall`2.RunCall(HttpRequestMessage 
request, Nullable`1 timeout)")
   at 
Google.Ads.Gax.Interceptors.UnaryRpcInterceptor.Intercept[T,TResponse](Task`1 
task, Action`1 callback)
   at Grpc.Net.Client.Internal.GrpcCall`2.GetResponseHeadersCoreAsync()
   at 
Google.Ads.Gax.Interceptors.UnaryRpcInterceptor.Intercept[T,TResponse](Task`1 
task, Action`1 callback)
   at 
Google.Api.Gax.Grpc.ApiCall.GrpcCallAdapter`2.<>c__DisplayClass4_0.<<CallAsync>g__WaitAndCallHandlers|0>d.MoveNext()
--- End of stack trace from previous location ---
   at 
Google.Api.Gax.Grpc.ApiCallRetryExtensions.<>c__DisplayClass0_0`2.<<WithRetry>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at 
Google.Api.Gax.Grpc.ResponseAsyncEnumerable`3.ResponseAsyncEnumerator.MoveNextAsync()
   at 
Microsoft.Ads.Mca.Implementation.AdsSync.Helper.GoogleSyncHelper.<>c__DisplayClass6_0.<<GetCustomerResult>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at 
Microsoft.Ads.Mca.Implementation.AdsSync.Helper.GoogleSyncHelper.<>c__DisplayClass6_0.<<GetCustomerResult>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at 
Microsoft.Ads.Mca.Common.Client.Common.ExternalServiceHelper.CallWithRetryAsync[T,V](Func`1
 
func, IExternalServiceExceptionHandler exceptionHandler, ILogShared logger, 
String property, ValueTuple`2 retryPolicy, V argumentsTuple)

Thanks,
Guofu

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