OAuth Token of type 'Client Credentials' generates 'User Not Authenticated' in Inbound web service callIssue Making a call to the instance to obtain OAuth token of Grant Type client_credential and passing client id and client secret to the OAuth endpoint https://<instance_name>.service-now.com/oauth_token.do successfully generates an Access Token. However, using this token in the Authorization header in the subsequent call to access a resource in the ServiceNow instance generates the error: "Required to provide Auth information""User Not Authenticated" Note: This KB applies up to the Vancouver version. Starting from the Washington release, ServiceNow began supporting the "Client Credentials" grant type by linking it with a user in the OAuth Entity record. For more information refer to KB1645212ReleaseUp to VancouverCauseThe OAuth Access token that is generated when the grant type is client_credential is associated with the 'guest' user. This can be verified by checking the 'oauth_credential' table for 'Token' and 'User'. For the OAuth Authorization to work the token should be associated with a User on the instance and not to the guest user. ResolutionClient credential grant type is not applicable for Inbound OAuth Authentication to ServiceNow. Please use one of the below default Grant Types: 1)Resource Owner Password Credentials 2)Authorization Code