Issue getting data from morningstar API using token

I have been trying to pull data from a Morninstar API with the following code:

% Manually set Authorization header field in weboptions

options = weboptions('HeaderFields',{'Authorization',...

['Basic ' matlab.net.base64encode([Username ':' Password])];...

'Cache-Control', 'no-cache'; ...

'Content-Type', 'application/x-www-form-urlencoded';...

'grant_type=authorization_code&code=7962e5a1-dd81-412f-8993-6&redirect_uri=https%3A%2F%2abcd8027.morningstar.com%2Ftestapp%2Fcallback', ''});

% Make a request using these options

response = webwrite('https://www.us-api.morningstar.com/token/oauth', options)

access_token = response.access_token;

token_type = response.token_type;

headerFields = {'Authorization', ['Bearer: ', access_token]};

options2 = weboptions('HeaderFields', headerFields);

data = webread('https://www.us-api.morningstar.com/ec/v1/securities/FOUSA06N2B%7CFEUSA04ABV?universeIds=FOUSA%7CFEUSA%7CFCUSA&langCult=en-US&dataPoints=n%7Ct&currencyId=USD', options2);

I am trying to pull the data on the securities in the following example for starters just to prove out that I can get access to the server before I try getting the data I actually want:

https://developer-beta.morningstar.com/apis/investment-analysis/securities-us/1.0.0/openapi-specification

I am successfully getting the token as the value of response above is what is expected if you look at the example here:

https://developer-beta.morningstar.com/apis/getting-started/authorization-tokens-api/1.0.0

So I think my issue is the syntax I am using in setting up options2 to pass my token to the server with the data. I have tried multiple ways of forming the request using both HeaderFields and KeyName/KeyValue. I have also tried setting RequestMethod to 'GET' even though I shouldnt have to do that with webread.

I am sure I am missing something simple and obvious but for the life of me I cannot figure it out!

[Jesse Mills]

Apologies, the error I get is in the data = webread line and says the server returns "status 401" which is unauthorized, this is why I think my syntax regarding sending the authorization token is incorrect..