Object reference not set to an instance of an object on New-AzureADMSInvitation

[Xentraxx]

Hello everyone,
this is my command:
New-AzureADMSInvitation -InvitedUserEmailAddress $email -SendInvitationMessage $false -InviteRedirectUrl "https://example.com" -InvitedUserDisplayName "$lastname, $firstname"
The variables are all initialized.
Nevertheless I am getting the following error:

New-AzureADMSInvitation : Object reference not set to an instance of an object.
At C:\Users\attenbej\Desktop\inviteUsersToAAD.ps1:84 char:9
+         New-AzureADMSInvitation -InvitedUserEmailAddress $email -Send ...
+         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [New-AzureADMSInvitation], NullReferenceException
    + FullyQualifiedErrorId : System.NullReferenceException,Microsoft.Open.MSGraphV10.PowerShell.NewAzureADMSInvitation

Could you please look into that, as I am pretty sure that my command is correct.
$PSVersionTable.PSVersion shows:

Major  Minor  Build  Revision
-----  -----  -----  --------
5      1      17763  1490

Thanks in advance.

[Xentraxx]

I also reported this issue here: https://feedback.azure.com/forums/598699-azure-cloud-shell/suggestions/42345556-please-resolve-error-in-new-azureadmsinvitation
If anyone else has also problems with it, feel free to upvote.

[Xentraxx]

The cause of this error seems to be, that some Tokens (got mine with the MSAL.PS module) can't be processed properly by the module and result in this error. If I invoke the request myself it works fine.
This is the solution in case you have the same problem:

Invoke-RestMethod -Uri https://graph.microsoft.com/v1.0/invitations -Method POST -UseBasicParsing -Body "{`"invitedUserEmailAddress`":`"$email`",`"inviteRedirectUrl`":`"$redirectUrl`", `"invitedUserDisplayName`":`"$lastname, $firstname`"}" -Headers @{"Authorization"="Bearer $($token.Accesstoken)"}

[robey-ms]

+1 hitting this running under an SPN from an ADO pipeline. Thanks for the hint on the token.

Edit:
Looks like this was a bad implementation on my end. I needed to pass both the AaDAccess token and the MSAccessToken to Connect-AzureAD. There are a number of bad implementations that come up in web searches.