Executed 'Function1' (Failed) The remote server returned an error: (400) Bad Request.[Premium]

**.Net framework Azure function is deployed in Docker container WebApp**

I am trying to connect Sharepoint online to get the list of changes. For that I am using Microsoft.Sharepoint.Client CSOM dll.(Microsoft.SharePointOnline.CSOM) version 16.1.19404.12000. Initially i am working with .net standard function, then when I try to connect the sharepoint I am getting **.The remote server returned an error: (400) Bad Request.**. Then I heard that Sharepoint DLL is supportable for .net framework not for .net core / standard. Then I created Azure function 1.0 and ran in local, I could connect the sharepoint.

But when I published to Web App and run the funtion there, i am getting back the same error: **.The remote server returned an error: (400) Bad Request.**. I found there was a work around is to create a WCF web service and to link it. Apart from that any other way of solution to get rid of the issue.

**To Reproduce**
Steps to reproduce the behavior:
1. Go to Visual studio, create Azure function 1.0
2. Write code to connect the sharepoint using the above dll mentioned in the description.
3. run it locally and you could able to connect the SP succesfully
4. publish it to Azure function app of docker enabled web app
5. run it in the portal, you could see the error

**Expected behavior**
It should connect as it is in local.

**Screenshots**
If applicable, add screenshots to help explain your problem
.

**Additional context**
suggestions are welcome. do we have any release from Microsoft on the new future release?