Use Connect-SPOService with Powershell 6 (core version) - powershell

Question

I'm trying to connect to a sharepoint environment and I want to do that with Powershell version 6. Why? Eventually, I want to put the PS commands in a .net core 3 application. And as far as I know I cannot use PS5.1 in .net core.
It is about this powershell script:
Import-Module -Force -name Microsoft.Online.SharePoint.PowerShell;
Import-Module -Force -name Microsoft.Online.SharePoint.PowerShell -DisableNameChecking;
$username = 'admin#shootme.com';
$password = 'right now';
$cred = New-Object -TypeName System.Management.Automation.PSCredential -argumentlist $userName, $(convertto-securestring $Password -asplaintext -force);
Connect-SPOService -Url https://shootme.sharepoint.com -Credential $cred;
When I try this in the default PS 5.1 it just works fine. When I try this with PS 6.2.3, I get an error:
Connect-SPOService : The remote server returned an error: (400) Bad Request.
At line:1 char:1
+ Connect-SPOService -Url https://shootme.sharepoint.com -Credent ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Connect-SPOService], WebException
+ FullyQualifiedErrorId : System.Net.WebException,Microsoft.Online.SharePoint.PowerShell.ConnectSPOService
Does the newer Powershell have different syntax orso, of what am I doing wrong?
Also, maybe there is a way to run scripts in ps 5.1 when running them in .net core?

Answer 1

Have you tried connecting manually by removing the credentials portion and letting it prompt you for a login and test if that resolves successfully?
Edit: I do know you can also call powershell from a .bat like so:
powershell -version 2 .\xyz.ps1
But not knowing what you're going for exactly makes it tough to suggest if that's even a viable option.