Problem connecting Sharepoint site. Security issue?

I have problem to do “Get File” activity package from custom activities package.

Encountered following error message:

Message: The IDCRL response header from server ‘https://xxxxxxxxx /’ is not valid.
The response header value is ‘NTLM’. The response status code is ‘Unauthorized’. All response headers are ‘SPRequestGuid=6f5f3d9f-3c5d-20ef-5456-7c1ba60d794b, request-id=6f5f3d9f-3c5d-20ef-5456-7c1ba60d794b, SPRequestDuration=1, SPIisLatency=0, MicrosoftSharePointTeamServices=15.0.0.4605, X-Content-Type-Options=nosniff, X-MS-InvokeApp=1; RequireReadOnly, Content-Length=16, Content-Type=text/plain; charset=utf-8, Date=Tue, 10 Mar 2020 09:32:46 GMT, Server=Microsoft-IIS/8.0, WWW-Authenticate=NTLM, X-Powered-By=ASP.NET’.

I am not sure if there is security issue for this url? Or how can I tell?

Hi welcome to the community!
Are you connection to your own SharePoint server or in cloud? I guess it is yours, when you connect using your browser, do you need to type user/password or you have integrated authentication?

Yes, i do type user/password. So, you think this is probably because of our internal organization Sharepoint security setting? I will check as well. thanks