You have a Microsoft 365 subscription that contains the domains shown in the following exhibit. Which domain name suffixes can you use when you create users?
A.
only Sub1.contoso221018.onmicrosoft.com
B.
onlycontoso221018.onmicrosoft.com and Sub2.contoso221018.onmicrosoft.com
C.
only contoso221018.onmicrosoft.com, Sub.contoso221018.onmicrosoft.com, and Sub2.contoso221018.onmicrosoft.com
I believe the correct answer is not listed as an option. The correct answer would be sub1.contoso221018.onmicrosoft.com and contoso221018.onmicrosoft.com.
Agreed. Just added my own domain to a test tenant but then did not add the verification TXT record to the hosting provider. Status of the domain in Microsoft 365 is "Incomplete setup".
I was NOT able to add a new user with that domain.
sub1.contoso221018.onmicrosoft.com and contoso221018.onmicrosoft.com would be correct but I think onmicrosoft.com can be used even if is incomplete.
So sub1, sub2 and contoso221018 are valid.
The correct answer is:
✅ C. only contoso221018.onmicrosoft.com, Sub1.contoso221018.onmicrosoft.com, and Sub2.contoso221018.onmicrosoft.com
🧠 Explanation:
When creating users in Microsoft 365, you can only assign domain suffixes from domains that are either "Healthy" or based on the tenant's default .onmicrosoft.com domain and its subdomains.
From the image:
contoso221018.onmicrosoft.com → ✅ Healthy
Sub1.contoso221018.onmicrosoft.com → ⚠️ Shows "Possible service issues" but is a valid subdomain (still usable unless explicitly blocked)
Sub2.contoso221018.onmicrosoft.com → ℹ️ Incomplete setup — still available for user creation as long as it's part of the verified domain tree
contoso.com → ❌ "Incomplete setup" and not verified yet → cannot be used
So, only the .onmicrosoft.com base domain and its subdomains (Sub1 and Sub2) are usable in this case.
answer is D. even if the domain status is incomplete setup, as long as the domain ownership is verified by adding a TXT record or in the case of sub-domains, it's autoverified, it can be used as a suffix for UPNs. incomplete status doesn't mean the domain is not verified, it can be verified or not verified, we can't be sure unless we check the domain
D is correct because Microsoft may list the setup as incomplete even after applying TXT record verification. If you applied services while adding the domains, you will be required to submit additional domain records before the error goes away. Try with with Intune onboarding or Exchange selected.
You can add a subdomain for a user regardless of its status if the root domain is healthy. Whether the services will work is a separate issue. If the root domain is unverified, you cannot set it as a suffix
I vote for B because I think is the only one that has the correct option (even though it is also incorrect): contoso221018.onmicrosoft.com
Copilot says:
You can only use the domain name suffix that has a healthy status for creating users, which is contoso221018.onmicrosoft.com.
Thus, the correct answer is B. only contoso221018.onmicrosoft.comand Sub2.contoso221018.onmicrosoft.com.
Even though Sub2.contoso221018.onmicrosoft.comis listed in option B, it isn't used as it has an incomplete setup, so only contoso221018.onmicrosoft.comis the correct and available suffix. Let me know if you need further assistance or have any other questions!
The domain name suffixes that can be used when creating users are those that have a "Healthy" status in your Microsoft 365 subscription. In this case, contoso221018.onmicrosoft.com is marked as Healthy, so it can be used. Other domains like Sub1.contoso221018.onmicrosoft.com and Sub2.contoso221018.onmicrosoft.com have issues or incomplete setups, meaning they cannot be used until the setup is completed and issues resolved.
Therefore, the correct answer is: B. only contoso221018.onmicrosoft.com and Sub2.contoso221018.onmicrosoft.com.
The image only shows two verified domains (contoso221018.onmicrosoft.com and Sub2.contoso221018.onmicrosoft.com), and it's not recommended to use the default [invalid URL removed] domain for user accounts.
If you go by the picture, the answer is B. This is because contoso.com and sub2.contoso221018.onmicrosoft.com have an incomplete setup. If you go by the logic, it's a complete nonsense since sub2 has already been verified via the main domain.
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