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ItemAdded remote event Receiver return clientcontext Null working fine on other same level webs pages library, i used TokenHelper class for get content on behalf of current login user, i tried to use Admin account as well if Client context null but that also not work , i tried to detach and attach again on new libraries but still null.

I tried below ways but no success:

  1. ClientContext clientContext = TokenHelper.CreateRemoteEventReceiverClientContext(properties)

working fine in other webs but not working on new Web Library under same site collection.

  1. // obtain web URL somehow - line below is fine for a list item RER, but you'll need another approach elsewhere:
string webUrl = properties.ItemEventProperties.WebUrl;

Uri webUri = new Uri(webUrl);

string realm = TokenHelper.GetRealmFromTargetUrl(webUri); 
string accessToken = TokenHelper.GetAppOnlyAccessToken(TokenHelper.SharePointPrincipal, webUri.Authority, realm).AccessToken; 
using (var clientContext = TokenHelper.GetClientContextWithAccessToken(webUrl, accessToken))  
{
    // do CSOM stuff here..
}

this way showing item may be deleted or checkout by other user.

Please let me know if any other way to fix this issue .

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