Allow or block invites to specific organizations - Azure AD - Micr…
https://learn.microsoft.com/en-us/azure/active-directory/external-identities/allow-deny-list
To add an allowlist: Sign in to the Azure portal. Select Azure Active Directory > Users > User settings. Under External users, select Manage external collaboration settings. Under Collaboration restrictions, select Allow invitations only to the specified domains (most restrictive). Under TARGET DOMAINS, enter the name of one of the domains that you want to allow. ... When you're done, select Save.
Sign in to the Azure portal.
Select Azure Active Directory > Users > User settings.
Under External users, select Manage external collaboration settings.
Under Collaboration restrictions, select Allow invitations only to the specified domains (most restrictive).
Under TARGET DOMAINS, enter the name of one of the domains that you want to allow. ...
When you're done, select Save.
DA: 50 PA: 5 MOZ Rank: 62