* Create a guest user account in contoso.com.
* Run the New-AzureADMSInvitation cmdlet. [For Microsoft Active Directory]
* Run the New-MgInvitationcmdlet. [For Microsoft Entra]
Note:
* New-AzureADMSInvitation
This cmdlet is used to invite a new external user to your directory.
* New-MgInvitation
Microsoft.Graph.Identity.SignIns
Use this API to create a new invitation or reset the redemption status for a guest user who already redeemed their invitation. Invitation adds an external user to the organization Reference:
https://docs.microsoft.com/en-us/azure/active-directory/external-identities/b2b-quickstart-add- guest-users-portal
https://learn.microsoft.com/en-us/powershell/module/microsoft.graph.identity.signins/new- mginvitation
https://docs.microsoft.com/en-us/powershell/module/azuread/new-
azureadmsinvitation?view=azureadps-2.0