MSOLSERVICE ERROR

That module is deprecated, use the Graph SDK for PowerShell or the Entra PowerShell module instead.

Consider this:

1. Use Basic Authentication Explicitly

Make sure you're passing credentials correctly:

$cred = Get-Credential
Connect-MsolService -Credential $cred

This prompts for username/password and uses Basic auth.

2. Check Proxy Settings

• Ensure the proxy supports Basic authentication.
• Try bypassing the proxy or configuring PowerShell to use direct internet access.

You can also set proxy settings manually:

[System.Net.WebRequest]::DefaultWebProxy.Credentials = [System.Net.CredentialCache]::DefaultNetworkCredentials

3. Run PowerShell as Administrator

Sometimes elevated permissions help avoid authentication issues.

4. Update PowerShell Modules

Make sure you're using the latest version of the MSOnline module:

Install-Module MSOnline -Force

Or consider switching to the newer AzureAD or Microsoft Graph modules if you're doing modern identity management.