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D VelD Vel 

Named Credentials is not working for Apex Callouts

I am trying to understand how to set up the Named Credentials & OAuth Provider in Salesforce for calling the External REST API. Before setting this up I tested the call to the REST API through Apex like and it works fine
public class TestD365API {
    public final String clientId = 'xxxxxxx';
    public final String clientSecret = 'xxxxxx';
    public final String tenant_id = 'xxxx';
    public final String resource = 'https://abc.dynamics.com';

    public String getD365Customer(){             
        String reqbody = 'grant_type=client_credentials&client_id='+clientId+'&client_secret='+clientSecret+'&tenant_id='+tenant_id+'&resource='+resource;
        Http h = new Http();
        HttpRequest req = new HttpRequest();
        HttpResponse res = h.send(req);
        deserializeResponse resp1 = (deserializeResponse)JSON.deserialize(res.getbody(),deserializeResponse.class);
        String atoken = resp1.access_token;
        System.debug('Access Token=========' + atoken);

        Http http1 = new Http();
        HttpRequest req1 = new HttpRequest();
        req1.setHeader('Authorization','Bearer '+atoken);
        HttpResponse res1 = http1.send(req1);
        System.debug('Response Body=========' + res1.getBody());
        return res1.getBody();                

    public class deserializeResponse
        public String token_type;
        public String expires_in;
        public String ext_expires_in;
        public String expires_on;
        public String not_before;
        public String resource;
        public String access_token;

I am passing 5 parameters in the request body to get the bearer token from the Authorization Provider and passing the token to the Rest endpoint and retrieving the data back.
Now trying to use Named credentials instead like below
User-added image
where in the Authorize URL I am giving as https://login.microsoftonline.com/tenant/oauth2/authorize?grant_type=client_credentials&tenant_id=xxxxxxxxxxx
And changed my Apex Code like
User-added imageI am not sure how to pass all the parameters (grant_type,tenant_id, client_id,client_secret,resource) to the Auth Provider and the bearer token to the Rest API endpoint through Named Credentials and get the response back. I am sure this is not the firewall/issue on Client end as I am able to test it through Apex Code. Any help is appreciated
Devi ChandrikaDevi Chandrika (Salesforce Developers) 
Hi ,
Try by appending callout: __namedCredential  to your callout name.Or if you are using named credential form managed package use like this callout:packageName__namedCredential.

Please refer below link which might help you in this

Hope this helps you
Let me know if this helps you. Kindly mark it as solved so that it may help others in future.

Thanks and Regards
Dedeepya MunjuluriDedeepya Munjuluri
I am having same issue. Did you find any solution?