Resolving Connect-MgGraph Cmdlet Errors in PowerShell 5.1 and 7.4

Learn how to troubleshoot and fix the `Connect-MgGraph` cmdlet errors in PowerShell 5.1 and 7.4. Our detailed guide offers practical solutions to common issues with Microsoft Graph connections.
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Troubleshooting Connect-MgGraph Cmdlet Errors in PowerShell

When working with PowerShell scripts for connecting to the Microsoft Graph API, users might encounter frustrating errors. An example scenario involves the Connect-MgGraph command resulting in different errors depending on the version of PowerShell being used. In this guide, we will explore why these errors occur and how to effectively resolve them.

What Errors Can Occur?

When attempting to connect to Microsoft Graph using certificate-based authentication, users have reported the following errors:

PowerShell 5.1 Error:

[[See Video to Reveal this Text or Code Snippet]]

PowerShell 7.4 Error:

[[See Video to Reveal this Text or Code Snippet]]

Environment Details

Current Setup:

The script executes Connect-MgGraph, Connect-PnPOnline, and Connect-ExchangeOnline.

Latest Microsoft.Graph version: 2.14.1

PnP.PowerShell version:

1.12.0 for PowerShell 5.1

2.3.62 for PowerShell 7.4

Given this environment, let's discuss the solution to circumvent these errors.

Solution: Disconnect-PnPOnline

Why Use Disconnect-PnPOnline?

The underlying issue stems from the fact that both Connect-MgGraph and Connect-PnPOnline may be leveraging the same app registration. Depending on the connection made first, this can lead to conflicts that cause the aforementioned errors.

Implementing the Fix

To resolve the errors effectively:

Modify Your Script: Before executing the Connect-MgGraph command, you should add a command to disconnect any existing PnP Online connections.

Here’s a proposed change to your code:

[[See Video to Reveal this Text or Code Snippet]]

Re-Testing: After implementing this change, rerun your PowerShell script in both versions (5.1 and 7.4). You should find that the Connect-MgGraph cmdlet now executes without throwing errors.

Conclusion

By utilizing Disconnect-PnPOnline before invoking Connect-MgGraph, you can avoid common connectivity issues and streamline your PowerShell scripts when working with the Microsoft Graph API. Always ensure that different connections do not conflict, especially when they share registration details.

This small adjustment can save you considerable time and frustration as you develop automation scripts using PowerShell and Microsoft-centric APIs.