How to manage guest access to Microsoft 365 groups in Exchange Online

Guest users with specific domains can be allowed or blocked from being added to Microsoft 365 groups across the organization.

You can manage guest access to Microsoft 365 groups in Exchange Online using Exchange Online PowerShell.

The following steps show how to manage guest access to Microsoft 365 groups in Exchange Online using Exchange Online PowerShell:

Steps to add more domains to existing allow or block lists using Exchange Online PowerShell

1. Download the Script for Allow/Block policy ( Set-GuestAllowBlockDomainPolicy.ps1) for Allow/Block policy at Microsoft Download Center.
2. Run the following command to add more domains to an allow list: Set-GuestAllowBlockDomainPolicy.ps1 -Append -AllowList @("<domainname>")
3. Run the following command to add more domains to a block list: Set-GuestAllowBlockDomainPolicy.ps1 -Append -BlockList @("<domainname>")
4. <domainname> here refers to the guest domain for which you are managing access to Microsoft 365 groups in your organization.

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To learn more tips and tricks that can simplify your Microsoft 365 tasks, click here.