Access token issue on OAuth 2 flow

Hi Everyone

Greetings!.

While Testing the rest API (Json) from Swagger site, I have API Key and am using OAuth 2 but I am getting the below Error Message , Can anyone help to resolve this issue as I am new to SoapUI Tool.

The Site Name of this API is,  https://dnapi-qa.rpionline.com/rest/swagger/ui/index# and I have API Key as well.

{
   "ErrorLevel": "Error",
   "Exceptions": [   {
      "ExceptionType": "ArgumentException",
      "Message": "IDX12709: JWT is not well formed: '[PII is hidden]'.\nThe token needs to be in JWS or JWE Compact Serialization Format. (JWS): 'EncodedHeader.EndcodedPayload.EncodedSignature'. (JWE): 'EncodedProtectedHeader.EncodedEncryptedKey.EncodedInitializationVector.EncodedCiphertext.EncodedAuthenticationTag'."
   }]
}