Uploading some files at SharePoint Online using PowerShell

[Rachel-0107]

Reporting an Issue or Missing Feature

We want to use PowerShell to upload some files at Document Library in SharePoint Online.
I use custmer's PC and my customer has really stric environment.
First, Install the modules named PnP.PowerShell and SharePoint Online Management.
Then I tried to run a command below and failed.

Connect-PnPOnline -Url "https://XXXXX" -Interactive

I thought that this is a problem about proxy setteing and tried to change .pac.
Doing that I have to know the URL that is related to PnP command.
I think that using PowerShell and connecting SharePoint uses some website outthere.

If you know the URL that PowerShell go through , please let me know.

Expected behavior

PnP command can run correctly and can connect SharePoint Site to upload some files.

Actual behavior

PnP command cannot run correctly and cannnot connect SharePoint Site.

What is the version of the Cmdlet module you are running?

(you can retrieve this by executing Get-Module -Name "PnP.PowerShell" -ListAvailable)
-1.10.0
Windows 10