Method not found 'Void Microsoft.Graph.TokenCredentialAuthProvider'

Alex_Rechs 

I'd only expect to see that kind of error under the following conditions:

• A bug in the module;
• You have multiple versions concurrently installed and the wrong one is being called (likely one featuring an older version of Azure.Core.dll.)

I'm inclined to think it'll be the second case, in which case you can run the following script to remove all currently-installed versions (this is based on Windows PowerShell, not PowerShell) and re-install them (see the note in the comments about scope):

I don't use beta/pre-release versions and I am aware they sometimes need manual eviction. I haven't catered to this scenario in the script below.

<#
    Local administration rights are required for the "-Scope AllUsers" option to work. Otherwise, remove that option from the commandlets to do a per user refresh.
#>
try
{
    $Scope = "AllUsers";

    # Enumerate the currently-installed modules from the AllUsers scope.
    $Modules = (Get-Module -ListAvailable -Name "Microsoft.Graph.*" -ErrorAction:Stop).Name | Select-Object -Unique;

    # Output the list to the pipeline as a "just in case".
    Write-Warning -Message "Modules detected:";
    $Modules;

    # Now, chuck 'em all in the bin.
    $Modules |
        ForEach-Object {
            Uninstall-Module -Name $_ -AllVersions -Force -ErrorAction:Stop;
        }

    # The authentication module is a prerequisite for all the other Graph modules (which throw a warning on installation if this one isn't already present), hence breaking it out to be first to be re-installed.
    Install-Module -Name "Microsoft.Graph.Authentication" -Scope $Scope -Force -ErrorAction:Stop;

    # Re-install the rest, excluding the authentication module from above.
    $Modules |
        ForEach-Object {
            if ($_ -ne "Microsoft.Graph.Authentication")
            {
                Install-Module -Name $_ -Scope $Scope -Force -ErrorAction:Stop;
            }
        }
}
catch
{
    throw;
}

Cheers,

Lain