The answer is a missing or misconfigured organization relationship between the on-premises and cloud tenants. This is the most likely cause because the organization relationship is the specific trust object that governs free/busy sharing in an Exchange hybrid deployment, handling the secure exchange of calendar availability data between the on-premises Exchange and Exchange Online tenants. Since all other hybrid features like mail flow and mailbox moves are functioning, the issue is isolated to this relationship, which must be configured on both sides to enable cross-premises calendar queries. On the MS-102 exam, this scenario tests your understanding of how hybrid components are layered—a common trap is to assume the problem lies with the Hybrid Configuration Wizard or authentication, but the organization relationship is the dedicated mechanism for free/busy. A helpful memory tip is to think of the organization relationship as the “handshake” for calendars: if the handshake is missing, no availability data gets passed, even if everything else works.
MS-102 Deploy and manage a Microsoft 365 tenant Practice Question
This MS-102 practice question tests your understanding of deploy and manage a microsoft 365 tenant. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Your company is migrating from on-premises Exchange to Exchange Online. You have configured a hybrid deployment. During testing, you notice that free/busy information is not being shared between on-premises and cloud users. All other hybrid features work. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The organization relationship between the on-premises and cloud tenants is missing or misconfigured.
The organization relationship defines the trust and sharing settings between on-premises Exchange and Exchange Online tenants, specifically for free/busy information. Since all other hybrid features (e.g., mail flow, mailbox moves) work, the issue is isolated to the organization relationship, which must be configured on both sides to enable cross-premises calendar availability queries.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
The organization relationship between the on-premises and cloud tenants is missing or misconfigured.
Why this is correct
The organization relationship is required for free/busy sharing in hybrid.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure AD Connect has not been configured with the correct synchronization scope.
Why it's wrong here
Even with correct sync, free/busy may not work if the organization relationship is missing.
✗
The on-premises firewall is blocking traffic to the Exchange Online endpoints.
Why it's wrong here
Other hybrid features work, so firewall is not likely blocking.
✗
OAuth authentication is not configured between on-premises and Exchange Online.
Why it's wrong here
OAuth is optional for free/busy; basic authentication can work.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume OAuth is required for all hybrid features, but Microsoft specifically decouples free/busy sharing from OAuth in hybrid scenarios, making the organization relationship the primary culprit when only calendar availability fails.
Detailed technical explanation
How to think about this question
Free/busy sharing in a hybrid deployment relies on the OrganizationRelationship object, which uses the Availability service (EWS) to query calendar data. The on-premises Exchange server must have an OrganizationRelationship pointing to the Exchange Online tenant (using the targetAutodiscoverEpr URL), and the cloud tenant must have a reciprocal relationship; if either is missing or the scoped domains are incorrect, the query fails silently. A common misconfiguration is forgetting to run the `Get-OrganizationRelationship | Set-OrganizationRelationship` cmdlet on both sides after initial hybrid setup.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this MS-102 question in full detail.
Deploy and manage a Microsoft 365 tenant — This question tests Deploy and manage a Microsoft 365 tenant — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The organization relationship between the on-premises and cloud tenants is missing or misconfigured. — The organization relationship defines the trust and sharing settings between on-premises Exchange and Exchange Online tenants, specifically for free/busy information. Since all other hybrid features (e.g., mail flow, mailbox moves) work, the issue is isolated to the organization relationship, which must be configured on both sides to enable cross-premises calendar availability queries.
What should I do if I get this MS-102 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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