401 - Not able to get access token

[parameswari K]

Hello,

To get the system_access_token  for accessing the resources I am using the authorization token link. 

When I am hitting the URL for the first time I am able to successfully getting the response. 

If I am trying for second time or further more attempts to hit the URL for getting the access token, I am getting the below mentioned error.

{

    "message": "Bad Request",

    "details": [

        "400 : [{\"error\":\"invalid request: grant_type is required and cannot be blank\",\"error_uri\":\"https://authorization.cerner.com/errors/urn%3Acerner%3Aerror%3Aauthorization-server%3Aoauth2%3Atoken%3Amissing-required-field/instances/ba***********************f891\"}]"

    ]

}

How to resolve it or anything I missed?

Thanks. 

[parameswari K]

Can anyone give your inputs on this, how to get the new access token for further requests after the first token is expired?

If I am directly requesting the token resource URL for token it is saying below mentioned error message.

400 : [{\"error\":\"invalid request: grant_type is required and cannot be blank\",\"error_uri\":\"https://authorization.cerner.com/errors/urn%3Acerner%3Aerror%3Aauthorization-server%3Aoauth2%3Atoken%3Amissing-required-field/instances/ba***********************f891\"}

[Soumyajit Kundu]

Could you send the link and what all parameter you are setting to get the access token, because for me it is showing invalid grant in the first time only.

[Fenil Desani (Cerner)]

Hello,

Can you make sure the grant_type is no empty and correct?

Thanks,

Fenil