Below rest api code get publish feature fields 

function getPublishingPage(webUrl,listName,listItemId,publishingProperties, success, failure) 

{

    var itemUri =  webUrl + "/_api/web/lists/getbytitle('" + listName + "')/items(" + listItemId + ")";  

    getJson(itemUri,

       function(data){

           var pageItem = data.d;

           var selectProperties = [];  

           for(var idx in publishingProperties){

               if(!pageItem.hasOwnProperty(publishingProperties[idx])){

                   selectProperties.push(publishingProperties[idx]);

               }

           }

           if(selectProperties.length > 0) {

              //construct an additional query 

              var query = '/FieldValuesAsHtml?$select=' + selectProperties.join(',');

              var endpointUri = pageItem['__metadata'].uri + query;

              getJson(endpointUri,

                 function(data){

                    for(var property in data.d){

                       if(property == "__metadata") continue; 

                       pageItem[property] = data.d[property];   

                    }

                    success(pageItem);  

                 },

                 failure);

           } 

           else {

              success(pageItem);

           }   

        },

       failure);

}

In this article, How to download the SharePoint  library files in Document Library

 var file = clientContext.Web.GetFileByServerRelativeUrl(fileRef);

                clientContext.Load(file);

                clientContext.ExecuteQuery();                    

                ClientResult<Stream> streamResult = file.OpenBinaryStream();

                clientContext.ExecuteQuery();

#sharepoint #SharePoint Developer/  #O365 #Administrator/ #NET #jQuery #AngularJS #poweapps #powerautomate #spfx #pnp #workflo

 Login to your SharePoint Admin Center

Click on "Settings" from left navigation >> Click on "classic settings page" in the bottom>> Under Office graph, Select "Don't allow access to the Office Graph"

Click and Save the button

Could not authenticate to SharePoint Online using OAuth 2.0

 $username = "test@am.onmicrosoft.com"

$password = "******"

$cred = New-Object -TypeName System.Management.Automation.PSCredential -argumentlist $userName, $(convertto-securestring $Password -asplaintext -force)

Connect-SPOService -Url https://finders-admin.sharepoint.com -Credential $cred