SC-300 Certification Practice Question #58

Question

You work for a company named Contoso, Ltd. that has a Microsoft Entra tenant named contoso.com.

Contoso is working on a project with the following two partner companies:

•	A company named A. Datum Corporation that has a Microsoft Entra tenant named adatum.com.
•	A company named Fabrikam, Inc. that has a Microsoft Entra tenant named fabrikam.com.

When you attempt to invite a new guest user from adatum.com to contoso.com, you receive an error message.

You can successfully invite a new guest user from fabnkam.com to contoso.com.

You need to be able to invite new guest users from adatum.com to contoso.com.

What should you configure?

Accepted Answer

Inviting from adatum.com fails while fabrikam.com succeeds — a domain-specific restriction. MS Learn places the allow/deny domain list directly under External Identities > External collaboration settings > **Collaboration restrictions**. Either adatum.com is on a blocklist ("Deny invitations to the specified domains") or an allowlist excludes it ("Allow invitations only to the specified domains"); fixing either re-enables the invite. Suggested Answer, the 15-vote community majority, and two ≈6–8 👍 comments all align with D, and MS Learn confirms the exact location/behavior. The lone C vote (bardock100) even describes the Collaboration restrictions blade, contradicting its own letter.

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