Connect click and drop?

Hi,

I’m struggling re connecting my click and drop account, ive got the authorisation active in the apps so i have mws token, i go into click and drop click add amazon now it takes me on to amazon to connect and then when i do i just get a white screen with an error

{“data”:null,“errorCode”:“INVALID_ARGUMENTS”,“errorMessage”:“One or more fields were invalid”,“errorReference”:null,“httpStatusCode”:400,“isSuccess”:false,“rateLimitPerSecond”:null,“userMessage”:“One or more fields were invalid”,“validationErrors”:[{“propertyName”:“mws_auth_token”,“errors”:[“The MwsAuthToken field is required.”]}]}

i can see in the text it says mws auth token field is required but what am i missing? there’s no way to enter the mws on click and drop for amazon it just asks to connect.

Thanks