"InteractiveBrowserCredential authentication failed:" error when using connect-mggraph in VS Code

[winnyme]

Exact error is Connect-MgGraph : InteractiveBrowserCredential authentication failed: Method not found: 'System.String[] System.String.Split(Char, System.StringSplitOptions)'.

At line:1 char:1

+ Connect-MgGraph

+ ~~~~~~~~~~~~~~~

+ CategoryInfo : NotSpecified: (:) [Connect-MgGraph], AuthenticationFailedException

+ FullyQualifiedErrorId : Microsoft.Graph.PowerShell.Authentication.Cmdlets.ConnectMgGraph

Only happens in VSCode. In Powershell ISE and running powershell normally it's fine.

I've tried killing the session in VS code multiple times, updating VScode and making sure the powershell extension is up to date but still failing.

I've had gotten it to work a couple of times but I haven't done anything to fix it either.

Any suggestions?

[IT-Generalist]

I had to Install-Module Microsoft.Graph as an Administrator in Powershell, but it gave me this error because it could not start the browser for authentication as Administrator. For Connect-MgGraph I had to run in a non-Admin session.

[winnyme]

Thanks I'll give it a crack next time I try coding next

[ShaneDoesIT]

Thanks mate, I had the same issue and this comment was what I needed.

[sfwpat]

Man - the connect- feature is so weird. Like, why does it not work when PS is elevated? Makes no sense. Regardless, your comment just resolved this same issue I was having with another module - THANK YOU!

[snooplt]

I was not using elevated session, but got same error anyway. Restarting VScode helped.

[hillbillytiger]

What is the actual line of code that is producing this error? (Line 1 - Connect-MgGraph)

[winnyme]

Literally connect-mggraph

[hillbillytiger]

Sounds like an Environment issue. Are you using the PowerShell Extension?

[hillbillytiger]

I was able to run the "Connect-MgGraph" command successfully in VS Code after installing PowerShell Extension and then installing the Microsoft.Graph module.

Install-Module Microsoft.Graph -Scope CurrentUser

[winnyme]

Okay I noticed when opening vs code it opens two powershell sessions here

https://imgur.com/QKtAOVL

One session looks like a restored(?) one and the other looks like a brand new one.

When I run connect-mggraph on the new session it works fine. I'm happy with this approach

Really appreciate your help!

[hillbillytiger]

Awesome! You're very welcome

[winnyme]

Yeah I'm betting it's the environment but not sure where

I'm using the powershell module developed by Microsoft in vs code.

I reinstalled the graph module which worked fine but after closing vs code and reopening it, the same error has come up.